My wife was going through the online catalogue of an estate auction recently and found an attractive vintage Gilbert tambour style clock.
Gilbert mantel clock 1925
“Are you interested?” she said. “Sure”, I said, “put a maximum bid of $35”. We won the bid at $25 + tax and buyer’s premium, so, still under $35 CDN. Would I have paid more? Not likely. However, it is a handsome “Napoleon hat” styled clock but they were plentiful and cheap at the time and not particularly valuable or desirable today despite the fact that it is almost 100 years old.
Winter, along with the dry conditions of a typical Canadian home, can play havoc with wooden clock cases. In Canada we generally shut the doors and windows to keep the cold air out from mid November to mid March and we may stay inside for days at a time. During our Canadian winter we have difficulty controlling indoor humidity. Most modern homes have a commercial style air-exchanger that is designed to control relative humidity but it can only do so much.
I have dozens of clocks and most do not seem to mind the changes in humidity from season to season other than a rate adjustment. Those vintage clocks that are adversely affected tend to be clocks with thin veneers that separate from the frames of the cases. Less affected are Ogee clocks with thicker veneers.
My Ingersoll-Waterbury time and strike clock from the mid 1940s is a 70 year old clock and not a particularly valuable one to begin with but has been affected with peeling veneer. The peeling veneer is unsightly and must be addressed.
I am not opposed to using modern materials to repair a vintage clock and in this case yellow carpenters glue was used to close the gaps on both the left and right rear of the case. Yellow carpenters glue has a bonding strength of 3 tons and for maximum effect is should be clamped for 24 hours.
Split veneer on left side, rear
Both sides of the case were splitting open. The right was slightly worse than the left. Although I have several clamps I only had one to spare for this little project so, the job was spread over a few days.
Right side is clamped
Wax paper is placed between the clamp and the veneer to prevent the glue from adhering to the clamp itself.
Once the glue has bonded, the case is lightly sanded in the affected areas, the remaining cracks treated with wood filler and touched up with a dark stain.
Stain-able filler in the small cracks that remain
Two coats of shellac are then applied.
Not perfect but an improvement.
Clocks and museums
I am not fanatical about humidity as far as my collection is concerned but museums go to great lengths to control humidity. In museums temperature and humidity are interrelated, and must be monitored and controlled in conjunction with one another towards the goal of preservation. Room temperature is usually established according to the needs of visitors, and is set between 18 and 20°C. The relative humidity for the correct conservation of the works displayed usually lie in the limited range between 45 and 50%.
Clocks react to humidity differently. Clocks with wood pendulum rods need seasonal adjusting as the wood contracts and expands with changes in humidity. Wall clocks that have tight doors in the summer are easier to open in the winter as wood contracts.
High humidity can be mitigated through the use of humidifiers if there is sufficient concern about dry air and its effect on clock cases. It is a good option in the winter months.
If you have a modest collection of clocks I would not worry about humidity issues but you can be assured that seasonal changes can have an affect on your clocks.
This Gilbert tambour style mantel clock is model 2038 with a bim-bam strike or what Gilbert called a Normandy chime. The model number along with the words “Normandy Chime” are stamped on the bottom of the case. Gilbert called this the “Normandy Chime” as it was reminiscent of the old bells of Normandy (Corneville) in France. In terms of nomenclature within clock circles, calling it a “Chime” certainly adds to the confusion as this would be considered a striking clock rather than a chiming one.
Whoever did the past bushing work chose to avoid the motion works area, and for good reason
The Movement
And now to service the movement.
Dis-assembly of the movement is done in the conventional manner with the exception of two items. Both the striking disk (upper arrow) which runs off the cam wheel and the passing strike L bracket (lower arrow) which runs off the centre cannon are friction fit and must be pulled off beforehand to work on the movement. I don’t have a puller but two small screwdrivers positioned across from each other will lift the parts off with minimal effort. Do not polish the ends of these two rear pivots.
Arrows showing striking disk and passing strike L bracket
A prior examination of the movement revealed that it is generally good shape. Overall, the lantern pinions are in good condition with minimal wear. There has been extensive bushing work completed in the past. I see six replacement bushings on the back plate and seven on the front for a total of thirteen which suggests that there was a lot of wear. They are all in very good condition which tells me that the work was done fairly recently.
It also tells me that whoever did the past bushing work chose to avoid the motion works area and for two reasons. It is a tough one to fix because there is so little brass to work with and there is not a lot of torque on this wheel so it can be left as-is.
Although the following photo does not show it well, there is a lot of play in the bushing hole. This is the only one that is addressed in this servicing because I wanted to ensure good meshing of the motion works gears.
Motion works gear with bushing wear
To address the motion works bushing I sought advice from my colleagues at the NAWCC forum site with comments ranging from doing nothing to immediate replacement. The best advice came from a member who suggested I install a smaller diameter bushing and broach out the hole to fit the pivot and that is exactly what I did. A #46 Bergeon bushing was chosen with a diameter of 3mm and an inside diameter of 1.30mm. The pivot is 1.48mm and the result is a side wall that is about 0.80mm. This should allow the gear to mesh nicely and since there is not a lot of torque on this gear the fix should last a long time.
Re-assembling was straightforward. There are no helper springs on this movement so there was no tension pushing on the levers. The only adjustment I had to make was to pull the movement slightly apart to correctly align the stop pin to the stop lever so that the movement strikes as it should.
Arrow showing stop pin (my healing thumbnail from a mainspring that let go)
Since the movement has a Normandy chime the striking hammers are located outside and to the bottom of the movement.
Striking hammer assembly for Normandy Chime
The final process in re-assembly is to attach the hammer mechanism. But before doing so two parts are re-attached, the strike wheel and the L bracket which are pushed back into place. Once in place they can be moved slightly to sync the hourly and half hour strike.
Some folks give Gilbert movements a bad rap but they are not much different than a Sessions, or similar inexpensive movement of that period and the fact that this one is still functioning after over 90 years has to say something for its engineering.
Having a movement without a case is like a car engine without the body
I discovered this Aug Schatz & Sohne W3 (circa 1960) movement at a local antique store for under CAN$20. My wife said, “You should buy that, maybe you can make a case for it”. “Hmm”, I thought; that would be above my pay grade. The movement looked interesting and it was not expensive so, why not! But, having a movement without a case is like a car engine without the body but I was confident that one day I would have the solution.
This is a type W3 movement. “W3” refers to three chime tones, St Micheal, Whittington and Westminster.
Rear plate of the W3 movement showing chime selector and chime/strike hammers
I put out a plea and two people contacted me to say they had a case that would fit. One lived in Australia and the cost of shipping the case was too high. Another corresponded twice but I sensed he realized that his case would not fit. So, I put the movement away. On a positive note it runs well.
Schatz and Sohne W3 movement installed in a custom case
The pursuit of a custom made case
In the spring of 2018 my son’s girlfriend suggested that her grandfather could build the case. He loves doing this kind of work, she said. Although skeptical at first, I accepted her offer. Though a skilled craftsman her grandfather is over 90 years of age but spends as much time as he can in his woodworking shop in rural Virginia. He agreed to do the work. I sent the measurements to him but he preferred to have the movement in hand so it was sent to Virginia. He was able to use the movement as a guide in constructing the case. The clock was returned to me in December 2018 and it looked absolutely perfect.
Now to the installation of the chime block
The dimensions of the case allowed ample room to place a chime block. The block and rods are 7 1/2 inches long but even so there was not much room to spare on one end. The 8-rod chime block is from a Canadian clock supplier and is designed for a Hermle triple chime movement. There are not a lot of 8-rod chime blocks available through suppliers and given that I had little choice I had to assume that it would work for my clock and it does!
This video describes the placement of the chime block and some experimentation to achieve the optimum sound.
The tapered sections of the rods are an inch long and the hammers must be positioned to strike the wide point of the rods for best results. The oak base was trimmed to fit, allowing for about an eighth of an inch between the rods and the hammers. To close the distance to the rods the hammer wires are bent and centered on the rods. As they are brittle, chime rods should never be bent!
Chime block and oak piece forming the base
Once I was satisfied that the chime block was correctly positioned the block was secured. First I screwed the chime block to the hardwood base with 4 brass slotted screws. And finally, I secured the chime block through the base using two 1 1/4 inch slotted screws through pre-drilled holes.
I gave the case one more coat of shellac before putting it on display.
I am impressed with the outcome. Not all movements have such a happy ending.
Smiths Enfield mantel clocks are highly regarded by beginning clock collectors due to their popularity, abundance, and durable movements. For amateur clock repairers, they offer relatively few challenges.
I acquired my Smiths Enfield time-and-strike clock in 2013 from a young clock tinkerer in Dartmouth, Nova Scotia, but it was never a reliable runner. It would only run for a few minutes before stopping. Eventually, the clock was set aside and left in a corner of my shop.
Post war English time and strike movement
While not an especially attractive clock it embodies the utilitarian design typical of post-war English clocks from the late 1940s and early 1950s.
After several months and armed with new knowledge of clock repair, it was time to take a second look.
About Smiths Enfield
The Enfield Clock Company (London) Ltd. was established in 1929, with its first clocks sold in 1932.
The company utilized modern assembly line techniques to manufacture and assemble its clock movements, inspired by the American system of automated factories. Initially, clocks were sold wholesale and for export, with the movements supplied to shops that would then assemble the cases themselves. Enfield took pride in producing “British-made” clocks. However, in 1933, facing difficulties competing on price, the company was sold to Smiths Industries, which led to the name change to “Smiths Enfield”.
In 1935-1936, they introduced a striking 14-day clock in a Jacobean Oak case, which helped solidify the company’s position in the market. With the outbreak of war in 1939, the factory shifted to wartime production. While clock production continued, material shortages became a significant challenge.
After the war, American machines were allowed to be kept and production of the 53mm movement re-commenced. Production was later moved to the Smiths factory at Cricklewood and then later to their Welsh factory in about 1955. Under Smith Industries the production line was changed to watches. Ultimately all clock production was phased out and the company closed shortly thereafter.
A New Suspension Spring?
I serviced the clock in 2015, and it needed bushing work. Since the wear wasn’t severe, I thought I could delay it for another two years. However, the clock has not been running since then. At the time, I knew little about the purpose and function of a suspension spring, and since I assumed the one that came with the clock was correct, I thought there must be another issue causing the clock to run poorly.
Suspension spring post
It’s time to revisit the suspension spring to determine if that’s the issue.
Suspension spring location
Over the past four years, I have accumulated an assortment of suspension springs and, through trial and error, found one that is either correct for the movement or very close.
The suspension spring has a mounting hole on one end and a small T-bar on the other where the pendulum hangs. I replaced the old spring with a shorter, more flexible one. As a result, the clock started running. In the first week, it lost about five minutes, but after making minor adjustments to the pendulum length, the timekeeping improved with each change.
The takeaway from this is that the correct suspension spring is crucial to whether a clock runs, and it should be considered as one of the potential reasons when a clock is not working.
2018 was a successful year for my horological hobby in many ways. I met interesting people with fascinating stories, discovered new antique clock sources and had fun along the way. The best clock moments, in no specific order, during 2018 were:
Arthur Pequegnat Moncton
Finding an Arthur Pequegnat Moncton double-spring time-only wall clock was a big plus. This clock has been on my wish list for 5 years and I finally found one in excellent condition and the price was within my budget. This brings to seven Arthur Pequegnat clocks in my collection.
Seth Thomas #2 Regulator
The Seth Thomas #2 has been on my wish list for 5 years as well. This single weight-driven, time-only wall clock is from the 1920s. It is Mahogany veneered and like the Moncton is in very good condition. It is now hung in my front entry way.
Seth Thomas Regulator #2
August Schatz & Sohne W3 shelf clock
In August 2017 I asked for help finding a case for my Schatz movement after locating it in an antique store. Little did I realize that I would eventually have that case.
Rear plate
This is the result when you ask a 90 year old cabinet maker and joiner from Virginia to make a case for an August Schatz & Sohne W3 triple chime movement.
August Schatz & Sohne W3 mantel clock
A special thanks to all those who commented on articles and those who send me letters concerning their particular clock problem
Selling clocks
I sold two clocks this year not because I did not like or appreciate them but I must pare down my collection to allow space for new acquisitions. The Juba Schatz “bim-bam” time and strike mantel clock was one
Juba Schatz time and strike clock
and the other, a Mauthe Westminster mantel clock.
Acquiring new tools
Aside from small hand tools acquired this year, the most significant purchase was an L&R Ultrasonic cleaner which does a terrific job of cleaning clock parts.
Ultrasonic cleaner by L&R
Setting up and organizing my workshop
I managed to create space in my basement for an area to work on clock cases and other related woodworking tasks. A new drill press is on the far bench to the left.
New work area in basement
Cuckoo clock
My first cuckoo clock was a gift from my cousin this past year. It is in good working order but it will need a new set of bellows which will be one of my summer projects in 2019.
Dave’s cuckoo clock
Antiquevintageclock.com
I am pleased that my blog has also been very successful with over 93,000+ total views. I would like to thank all those who commented on articles and those who sent me letters concerning their particular clock issue.
I look forward to this new year and I am sure that 2019 will be an equally successful year as I further my horological pursuits.
The bad news is time flies. The good news is you’re the pilot
Ringing in the New Year is for reminiscing, reliving, looking back and looking forward.
As champagne corks pop, glasses are raised and fireworks explode into the sky, it is important to recognize the special symbolism this holiday brings with it. Amid promises of new beginnings and fresh starts comes a time of reflection and resolutions that more often than not tend to be short lived. Whether your goals consist of losing a little weight or improving your relationships with loved ones, it can make all the difference when hopes are transformed into words and actions.
Happy New Year clock lovers everywhere. Where will your horological journey take you in the months to come? Will it be finding that special clock, finally servicing mom’s favorite mantel clock or buying that unique clock repair tool?
Perhaps you have made resolutions that are not necessarily clock related and if so, avoid disappointment by making them specific, measurable, attainable, realistic and time-framed.
We all get the exact same 365 days. The only difference is what we do with them. There is an old Rolling Stones song called Time Waits For No-one and these two lines come to mind for this time of the year.
The dreams of the night time will vanish by dawn And time waits for no one, and it won’t wait for me
A few months ago I was following a NAWCC thread on the volatility of clock prices and thought I would echo comments from some of the posters as well as my own thoughts on why clock prices are seemingly all over the map.
Market conditions and demand play a significant role. I have watched sadly as prices for many early American clocks have plummeted yet high end clocks have retained their value. Theories abound including tough economic times and the newer generation’s rejection of anything old.
As one poster said, “How is a price arrived at? It is a murky and confusing process. People use a number of metrics including a price consistently achieved at auction and their own experience buying and/or selling. Most offer clocks for 2 to 3 times what they expect to receive knowing that they will be negotiated down because it is much harder to mark something up. It is a very inexact science and a source of much debate. An object is ultimately worth what someone is willing to pay.” That’s especially true of a truly rare clock for which there is no real comparison. The term “rare” is difficult to define but rare is what most “experts” generally agree upon.
However, what was once considered “rare” based upon the largely anecdotal experience of persons whether they are dealers, collectors or auctioneers has been changed by the “eBay effect” where rarity is challenged by many examples offered for sale. It has been a real game changer.
Sperry and Shaw New York style clock for $75
Another poster said, “Many people who deal in antiques and collectibles cannot know everything.” It is especially true in the blossoming low end line of antique shops which are no different than flea markets and junk shops. Many of these stores rely on impulse buying and clock experts are not their target customer.
The poster went on to say, “These clocks are not intended be sold to a serious collector, but the impulse buyer will make the clock purchase based on any number of factors – decorative; “That steeple clock would fit perfectly on the mantel” or “We don’t care that it might not work, it is for show only” or nostalgic; “We always wanted an old clock and we can now afford it”. You cannot discount the value of being able to see the object up close, smell it, touch it and hear it tick and or strike.”
A true clock store, usually with repair services, commands high prices for their wares, but the clocks usually come with a guarantee and the comfort of knowing that it will work well and will do so for years to come. Internet stores lack the fixed and variable costs (and reputation) that a brick and mortar establishment has and, all other things being equal, can offer their product at a lower cost. However, to make a true cost comparison, one should add the cost of shipping, packaging, handling and insurance that will need to be paid by the purchaser.
Is this an antique store or a junk shop?
I cringe as I walk into some of these shops. Most antique malls that I’ve discovered charge a monthly rate plus a commission percentage that result in significant markups. I spotted a Mauthe box clock priced at $300.00. It had a marred dial, broken beveled glass panels and marked “as-is”. When I asked the dealer about a better price, his answer was to knock 10% off. I walked away shaking my head.
There is no true “standard” pricing for any vintage or antique clock. As with most objects there is a price range that most would consider reasonable. I have paid more for some clocks than they are worth but armed with increased knowledge I can now make more informed decisions in the future. Caveat Emptor is the principle which should guide every buyer. The buyer alone is responsible for checking the quality and suitability of goods before a purchase is made. Education is the key as an informed buyer will make much better choices.
Chinese time and strike wall clock that seller calls a grandfather clock
Antique Grandmother Clock in Immaculate Condition
I am selling my wife’s grandmother clock because it does not suit the decor of our new home. She has treasured this antique for years and doesn’t want to part with it. Please make my execution as painless as possible and buy this clock quickly. Keeps perfect time and has no scratches on the cabinet.
This ad will be removed when I am executed…………..actually just before ,,,,,so purchase this clock now
This is a Chinese clock with a calendar feature, circa the 1960s. The ad refers to it as an antique. It is not!. Vintage, perhaps. The ad refers to it as a grandmother clock. It is not!
Grandmother clock by CraftLine circa 19780; a little shorter than a grandfather clock
The seller is asking $150, five times more than it is worth. It’s probably fairly reliable, looks well cared for and I would take it if it were given to me.
There are four general categories of clocks; quartz, electro-mechanical, electric, and mechanical. Mechanical clocks, whether they are antique or vintage are the focus of our discussion on why a clock runs slow.
We are quite accustomed to the accuracy of quartz clocks which lose or gain mere milli-seconds per week. Contrast that with an era when folks were content to accept that their mechanical clock would be a minute fast or slow through the week and it was a common practice to make small adjustments over the run cycle of a clock.
In fact, a typical American spring-driven clock in properly serviced condition may gain or lose a couple of minutes per week as a norm. Weight-driven mechanical clocks that gain or lose several seconds per week are considered to be very accurate.
That said, how many mechanical devices do you know run perfectly (relatively speaking) after 120 years.
A clock runs slow for a variety of reasons.
Let’s look at some factorsand examine each one.
Environmental
Pendulum too low or too high
The pendulum is the incorrect weight
Suspension spring length is incorrect
The suspension spring is not attached correctly
Lack of lubrication
Gummed-up lubrication (over-oiled)
The balance wheel needs adjusting
A weak mainspring
Changes or alterations when servicing
Clock cycle time variance
Slipping or binding
One-weight wall clock with large pendulum bob and rate adjustment on the bottom
Ogee clock showing replacement 1 oz rate adjusting pendulum bob
Environmental
Mechanical clocks are subject to a number of environmental factors which may cause them to gain or lose speed over the course of a year. These factors include heat, cold, and humidity. Increasing the ambient temperature of a clock will slow it down from the expansion and lengthening of the pendulum unless the pendulum is a compensating type using Mercury or dissimilar metal rods. Denser air also causes the pendulum to move more slowly.
Moving a clock from sea level to a higher elevation will affect the speed of the clock.
Pendulum bob with inset rate adjustment
Pendulum too low or too high: The lower the pendulum the slower the clock will run. Many pendulum clocks can be adjusted either by a set screw at the bottom of the pendulum or by an inset screw on the pendulum. In the absence of an adjustment on the pendulum, there is a regulator on the clock face. Use the small end of a double side key and insert it into the dial face of the clock to speed or slow down the clock.
Shortening the pendulum will speed up the clock. Anything that increases the length of the pendulum will reduce the rate of the pendulum and result in a clock that will run slower.
Parts of the clock related to the pendulum
The pendulum is the incorrect weight: If the pendulum is too heavy it causes the centre of gravity to be too low, consequently the clock will run slower. Having the correct weight pendulum for your clock ensures smooth running.
Suspension spring length: Often, when a clock is repaired by a person who has limited knowledge of the effect a replacement spring will have on the running of a clock they will occasionally install an incorrect length or thickness of suspension spring. Choose the suspension spring that is correct for your clock.
Rate adjustment under the 12. Use the small end of the double-sided key to make the adjustment
Suspension spring not attached correctly: A suspension spring is located at the top of the pendulum rod and is the flexible part that allows the pendulum to swing. It is the connection between the top post and the pendulum leader. If it is not installed securely the pendulum may not swing at all or will wobble, robbing the movement of its energy.
Lack of lubrication: Pivot holes that have dried up means that there is no lubricating barrier between the pivots and their bearing holes although the movement may otherwise be very clean. Small drops of clock oil applied to the dry pivot holes will ensure the clock runs well and will have a long life. Without oil, the steel pivots will wear the brass pivot holes resulting in wheels that will not mesh properly eventually stopping the clock.
Note: a small drop of oil in each bushing hole is all that is required.
Gummed-up lubrication: When a clock runs slowly the first instinct is to apply more oil. Old blackened or greenish oil in the pivot holes is a sure sign the clock has been over-oiled. Although there is an almost immediate improvement in the running of the clock it will not be long-lasting. In no time at all the clock will begin to run slowly again as the new oil mixes with the dirt and grime in the old oil. When this occurs the oil becomes an abrasive paste resulting in exacerbated wear. The only solution is servicing which includes disassembly, cleaning of the movement, addressing wear issues, reassembly, and testing.
Balance wheel needs adjusting: Regulation of the escapement consists of sliding the two-small weights attached to the center of the balance wheel. Inwards for fast and outwards for slow. Hold the wheel and push the small adjustment “finger”. Moving the finger toward your right will be faster and vice versa. Moving the finger one dot represents a change of about 10 seconds per day. The movement will have a directional indicator with an”S” for slow and “F” for fast on the sides adjacent to the balance wheel.
Balance wheel escapement
A weak mainspring: Often the mainspring you will find in your antique clock is the original one(s). The steel used at the time the clock was made was generally of higher quality than the steel used today with some exceptions. By their very nature mainsprings become weak over time.
Weak mainspring are called “set” mainsprings. If “set”, your clock will not run a full cycle, 8 days for eight-day clocks, a full 30 hours for one-day clocks, or the designed cycle. When a spring-driven clock is brought in for a professional repair the mainsprings are often replaced.
Most properly serviced clocks with their original mainsprings will run their full cycle. Should your clock require a mainspring replacement a correct size quality American or German-made mainspring should provide years of reliable service.
Changes or alterations: Changing or altering the mechanism such as replacing a gear with an incorrect teeth count may speed up or slow down a clock. Although movement parts may appear to be similar, manufacturers often made small changes resulting in parts that may not be interchangeable with the exact movement over the years.
Clock cycle time variance: American spring-driven eight-day clocks will run slightly faster at the beginning of their cycle by providing most of their power and run more slowly through the week as the power of the mainspring unloads. A spring-driven clock that is one or two minutes fast at the beginning of the week is often a minute or two slower at the end of its cycle. This is considered normal and no adjustment is necessary. The power on a weight-driven clock, on the other hand, is constant and the loss or gain in time at the beginning of the cycle will be the same at the end assuming no wear issues are slowing it down.
Slipping or binding: If your clock is losing hours per day something in the mechanism is slipping or binding. If your clock is losing minutes per day after all adjustments are made, it is likely bushing wear or some other worn component is causing the problem. Clock repairers have a term called end shake. End shake allows freedom of lateral movement for each of the wheels between the movement plates. If the plates are tight and there is no end shake, too much resistance will slow a clock. It is why clock repairers always check for sufficient end-shake when servicing the wheels on a movement.
Final thoughts
Your situation may be unique and if it is not a clock issue covered by this article I suggest consulting an expert in clock repair. If you have little experience and choose to do your own work on an antique or vintage clock, the mistakes you make may be irreversible.
There is also a certain element of risk working with mechanical clocks as the power contained in the mainsprings may cause serious injury if not handled properly.
Knowing why your clock runs slowly is the first step in diagnosing the problem. Addressing the issue is the next step. Beyond that, periodic maintenance and servicing with quality parts is the key to a long life for your clock.
An antique clock stopping unexpectedly can be frustrating, especially if it has been running smoothly for years. However, a stopped clock doesn’t always signal a major problem. In many cases, the issue can be resolved with a little troubleshooting and basic maintenance. Whether it’s a cherished family heirloom or a recent addition to your collection, understanding the possible reasons behind its stoppage can help you decide on the best course of action to bring it back to life.
Perhaps you’ve recently acquired a mechanical clock—whether inherited, gifted, purchased at an antique store, bought online, or one you’ve had for a while—and, for no clear reason, it has stopped working.
Categories of Clocks
There are four general categories of clock movements; quartz, electro-mechanical, electric, and mechanical. This post focuses on mechanical clocks, whether antique or vintage and if your mechanical clock has stopped, I may be able to help you get it working again.
Running Time
It may surprise some that mechanical clocks require regular winding. Eight-day clocks need to be wound once a week, while 30-hour clocks require daily winding. 31-day clocks only need winding once a month, and 400-day clocks, also known as anniversary clocks, are wound once a year. Additionally, many German and a small number of American clocks run for 14 days before needing a wind.
Kundo Standard 400-day clock winds with a key once per year
Arthur Pequegnat Moncton, 14-day time-only clock
Winding a Clock Movement
What does winding a clock actually mean? It means providing enough power to a mechanism that will allow it to run for its designed cycle.
For example for clocks with mainsprings, winding a mainspring implies turning the key until the clock winds no further. Time and strike clocks will have two winding arbours, chiming clocks generally have 3 winding arbours.
Clocks with weights have one, two, or three winding points. Absent the odd exception, a time-only clock will have one winding point, a time-and-strike clock will have two, and a chiming clock will have three. If there are no winding holes on the clock face, it is a weight-driven clock and the weights must be pulled up by hand.
In the case of clocks with mainsprings that provide the motive power for the time, strike, and chimes, wind each arbour until resistance is met and you cannot wind any further.
One key will fit all the arbours except the regulator arbour (on clocks that have this feature) which requires a smaller key. Clocks that have a regulator arbour originally came with a double-ended key; the smaller key is for the regulator.
Clocks generally wind clockwise but it is also common to find winding arbours that must be wound counterclockwise.
Over-winding
The idea of overwinding a clock is a myth. If a clock stops after being fully wound, it typically indicates that dirt, old oil, or grime on the mainspring has caused it to seize. Even if the mainspring, once unseized, has enough power, it still needs cleaning, which requires disassembling the movement and checking for other potential issues.
A clock in good working condition should complete its full cycle, whether that’s 30 hours, 8 days, 14 days, 31 days, or any other duration.
Winding arbors on a Seth Thomas mantel clock (arrows). The arbour over the 6 requires a smaller key to regulate the clock
Why Has My Clock Stopped
First and foremost, all clocks require motive power. Winding a clock stores potential energy in the mainspring, which is gradually released over a designed period of time. This energy is regulated by the escapement, a mechanism that controls the release of the energy in small, consistent increments, ensuring the clock keeps accurate time. Weights resting on the bottom of the baseboard will stop a clock and a completely unwound spring-driven clock will not run.
Is the clock in beat? Put your clock on a level surface. Listen to the tick and the tock of your clock. Try to minimize the sounds in the room you are in so that you can listen closely to its rhythm. It is in beat when its ticks and tocks are even….tick…tock…tick…tock…, and is out of beat when they are uneven, either, tick….. tock or tock tick…… Put another way, there must be an equal amount of time between the ticks and the tocks. When a clock is out of beat, it will not run, or it will run for a short time and stop. A clock’s beat must be regular to work properly.
Is the clock level? There are two ways to put a clock in beat. The first is to tilt the clock sideways, one way or the other, and listen for the beat to even out. When the beat is even, prop the clock to stay tilted that way. If it is a wall clock move the bottom section from side to side till you hear a steady beat. Now it will run in beat but it will obviously not look good.
Adjusting the crutch Adjust the crutch to one side or the other until the beat is even. The crutch is the rod that extends down from the pallets which rock back and forth on the escape wheel. The pendulum rod passes through either a loop (called a crutch loop) or a forked foot at the end of the crutch as indicated in the photo below. Incidentally, that rod needs to be in the middle of the crutch loop and can’t be tight inside the loop nor too loose. The crutch is attached to the pendulum leader which is then attached to a post with a suspension spring. Other mantel clocks require similar adjustment to the crutch and instructions may be provided on a label or a pamphlet that came with the clock. A clock with a balance wheel or lever-type escapement rather than a pendulum will operate on a non-level surface.
American made time and strike
Have repairs been done recently? Unless you had a friend fix your clock most reputable clock-makers will offer a warranty, typically 6 months to a year. If your clock stops within that time frame, contact the clock-repairer who may offer a few suggestions in the form of adjustments, over the phone before taking it back to the shop. If it still does not work have that person take a look at the clock.
Do you have the correct pendulum? Other than the winding key, it seems to be the item that gets lost the most. If lost or misplaced, ensure you buy a pendulum that is correct for your clock. One too light may mean that it does not run at all, too heavy and the centre of gravity is lowered and the clock might run too slowly. Clock suppliers such asPerrin or Timesavers will have the correct pendulum for your clock.
Pendulum bob with an adjuster for a French time and strike
Something is broken? If there is no resistance when turning the winding key, the mainspring has broken or a click has let go. If the mainspring winds but releases in your hand, the most common cause is a broken or worn click spring. This is a repair that requires removing the movement from its case, taking it apart, and replacing the worn or damaged part. If you are skilled with that kind of repair, go ahead and fix it, if not, a specialist is required.
A loud BANG when you turn the key indicates the mainspring has broken or let go. It may not be as simple as replacing the mainspring. If the mainspring breaks it might have taken out other parts with it such as pinions and gear cogs. This is called collateral damage. An inspection and a full servicing of the movement is the only solution. Occasionally a broken mainspring is the only problem but the broken spring must come out of the barrel. Some movement designs allow the barrel to be removed without disassembling the mechanism. Whether the barrel is removable or not, a correct mainspring must be sourced to replace it and installed in the barrel which is a job for an expert.
The mainspring inside the barrel may also have become unhooked. This could occur if the clock was wound backward or if the hooked end of the mainspring is split or broken. To address this, the clock will need to be disassembled, the spring barrel opened, and the cause of the unhooking identified. In some cases, a replacement mainspring may be necessary.
For time and strike clocks with open mainsprings, the break may be on one mainspring or both. The clock must be completely disassembled, mainsprings replaced, the movement inspected for other issues, reassembled, and tested.
Sessions click, brass spring, and ratchet
Why does my weight-driven clock stop? Ensure that the weights are in their correct location. If it is a new acquisition of a grandfather clock the three weights have a specific location. Look underneath the weight shells for marks indicating their location “L”, left side, “C”, center and “R”, right side. If there are no markings, use a scale to determine the one that is the lightest weight and put that on the left side.
Ridgway grandfather clock
When bringing up the weights to the top of the clock be careful that they are not run past their stops. You should have a full view of the weights on a weight-driven clock once wound.
Antique Ogee clocks and other weight-driven shelf clocks often lack their original weights, as these have been lost or misplaced over time. Eight-day clocks typically have heavier 8 or 9 lb weights while 30-hour clocks have lighter 2 1/2 lb or 3 lb weights. Incorrect weights for these clocks will cause them to stop.
Is the weight cord or the brass cable binding in any way? The cord or cable should be just long enough to accommodate the weights. A cord or cable that is too long will bind while being wound and stop the clock.
Gustav Becker two-weight wall clock requires a winding crank
Some clocks like weight-driven Vienna Regulators can be adjusted by a transverse regulating screw assembly where the crutch inserts into a slot in the pendulum. Turning a screw in one direction or the other will correct the beat.
Final thoughts
In conclusion, if you encounter a unique issue not addressed here, it’s advisable to consult a professional clock repairer or someone with expertise in mechanical clock repairs. Working with mechanical clocks carries a certain level of risk, as the power stored in the mainsprings can cause injury if not handled carefully. On the other hand, weight-driven clocks generally present less risk.
Although this article may not cover every possible scenario, I hope it has provided you with a clearer understanding of your clock’s issue and how to approach its resolution.
The Tempus Fugit Clock Company must be doing exceptionally well. Tempus Fugit clocks are everywhere, online for-sale sites, eBay, Kijiji and the like. Type “Tempus Fugit” in the eBay search box and dozens of wall clocks, grandfather clocks and mantel clocks will pop up.
Not only can the Tempus Fugit clock-makers pump out quality clocks they have also maintained a level of quality that is unmatched in the industry
The other day I found this 32″ clock (next photo) for the paltry sum of $30. What a deal! A truly inexpensive entry point for an exquisitely designed Tempus Fugit clock made by some of the worlds foremost craftsmen that you can add to your collection today.
A Tempus Fugit clock on an online for-sale site for only $30
Tempus Fugit clock-makers pump out quality clocks and they have also maintained a level of quality that is unmatched in the industry.
The factory is located in Timeville, Canada. I had a chance to visit the factory this spring and was able to converse with the owners, I said to Mr. Tempus and Mr. Fugit, “Your building could use a paint job”, to which Mr Fugit replied, “Don’t worry about it, clock-making is our strength”
Tempus Fugit Clock Co. factory in Timeville Canada
They graciously permitted me to install C and AA batteries in some of the movements on the factory floor. What a thrill! I really got a charge out of it. The 40,000 sq ft 400 sq ft factory floor is abuzz with activity. Placards of inspiration are everywhere such as “Time is on your side”, Time marches on” and “Time Flies”. The company also makes mechanical clocks. Here, a worker has all the movement parts laid out prior to assembly.
Putting it all together at Tempus Fugit
Gustav Becker and E. Howard might be great names in the clock world but Tempus Fugit always rises above them.
Anyway, back to repairing and restoring clocks. As they say at Tempus Fugit, “Time Flies” ……..or is it “Time Flees”?
Tick-Talk Tuesday is about the letters and comments I have received from you, the reader, concerning your clock, issues you might have had, challenges you face or a clock you would like me to profile and my responses to your questions with advice on your particular clock concern. For those comments and questions that stump even me, I consult within my clock circles for the best possible answer.
CM writes,
4 and 5 prong keys and singles
“Hello, I just read your article about keys for wind-up clocks. I have a parlor clock that belonged to my parents. It is on the wall, has a pendulum & requires winding. I believe that it is from the early 1980’s. And made by The Time Mfg. Co. However, I do not have a key – seems that it was lost prior to my getting it. Can you tell me what kind of key I need to get for it? And do you have any that would fit my clock that I could purchase? Thank you so much & have a great day.”
My reply,
“Hi CM. Thanks for coming to my blog. If it is made in the 1980s it is likely Chinese or Korean but it is hard to tell unless I see a photo. If I am correct these are 31 day movements. You could measure the arbours which will tell you the size but it likely takes a #6 or a #8 key which you can find here.”
Tick-Talk Tuesday is about the letters and comments I have received from you, the reader, concerning your clock, issues you might have had, challenges you face or a clock you would like me to profile and my responses to your questions with advice on your particular clock concern. For those comments and questions that stump even me, I consult within my clock circles for the best possible answer.
GGs Forestville Mantel clock
GG writes: “Hello there,,,I was wondering if you know much about my mantle clock and maybe it’s value?
I have attached some photos!”
My reply: “Thanks for coming to my blog. That is one of the nicest mantel clock cases I have seen on a Forestville and it appears to be in good shape.
Forestville is a Canadian Company based out of Toronto. They went out of business in 1979. They did not make their own movements instead sourcing them from England, France, the US and Germany though they made their own clock cases.
GGs clock showing German made movement and pendulum bob
You may or may not know that Forestville was called the Blackforest Clock company prior to WWII. So, you have a post war clock made in the late 1940s or early 50s. Later on In the 1950s Forestville went from using pendulums in their clocks to balance wheels (no pendulum). Forestville also sourced German movements exclusively after the war. Your movement (the brass works) was likely made by Mauthe or Hermle, both well known and well respected German companies.
You have what is known as a time and strike Bim-Bam clock. It strikes the respective hour and once on the half hour but makes a distinctive “Bim-Bam” sound as a result of one hammer striking one rod while the other two strikes two rods simultaneously.
Unfortunately there are thousands of similar clocks and Forestville clocks are not particularly distinctive but a clock such as this in good running condition might fetch about $100.”
GG writes back to explain that the movement is an Enfield from England which stands to reason if it was made immediately after the Second War.
Of the five anniversary clocks in my collection, none have cost me more than $30. It’s unfortunate because these clocks are truly fascinating devices. They are well-crafted, delicate, and ornamental, driven by spring mechanisms. While many thousands were produced, their abundance is reflected in their low value today. My focus is on collecting the older mechanical models, the last of which were manufactured over 35 years ago, and steer clear of the battery-operated anniversary clocks still being sold.
Among clock repair enthusiasts (horologists), opinions on anniversary clocks vary—some enjoy working on them, while others struggle to develop an affinity for them. I fall firmly into the former group, finding these clocks both intriguing and enjoyable to work on.
Kundo 400 day torsion clock
Gustav Becker, Haller, and Schatz 400-day clocks are certainly more desirable, better made, and fetch higher prices. While I don’t have any of these makes in my collection, I am always on the lookout for more desirable and collectible models.
Movement prior to cleaning and showing verdigris on the spring barrel
I picked this up for $5 at a local antique store. When buying one of these clocks, regardless of the price, it’s crucial to check that all parts are present, as sourcing a missing part can be nearly impossible unless you purchase an identical clock for parts. Often, the only issue is a broken suspension spring.
Fortunately, this Kundo clock was complete and in generally good condition. However, the suspension spring had clearly been snapped off due to improper transport. Many people either forget about or are unaware that these clocks feature highly effective pendulum locking mechanisms.
These are called torsion clocks because there is a weighted disk or wheel, often a decorative wheel with 3 or 4 chrome or brass balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (otherwise known as a suspension spring). The torsion pendulum rotates about the vertical axis of the wire, twisting it, instead of swinging like an ordinary pendulum.
These clocks operate very slowly—in the case of this Kundo Junior, just 10 beats per minute compared to 100 beats per minute or more for a typical pendulum mantel clock. Due to the slow movement of the gears, wear is minimal, and it’s quite common to find these clocks with a broken suspension spring as their only issue.
Front plate removed
The movement was disassembled and cleaned in an ultrasonic cleaner. The mainspring was removed from the barrel, cleaned, and serviced. Otherwise, there was minimal wear to the pivot holes. In fact, I have never needed to install a bushing in an anniversary clock because their slow operation results in very little friction.
The old spring was very twisted
Now, it’s time to install the new suspension spring. The suspension spring is a very thin piece of steel running down the back of the clock, designed to twist back and forth while suspending the pendulum balls. It’s crucial not to kink or bend it, as a bent or crimped spring is the most common reason these clocks fail to function properly.
You can purchase pre-assembled suspension springs in kit form—springs already fitted with blocks and a fork—but I’ve found it far more cost-effective to buy the springs separately and re-use the blocks and fork. To ensure accuracy, I consulted my Horolovar manual (I eventually purchased one) to find the exact template—Kundo 5E, in this case. I then unscrew the blocks and fork to install the new spring. Here is an example of a suspension spring from a Kern 400-day clock.
A new suspension spring was installed on a Kern
Installing the suspension spring requires a little patience. While it is a delicate process, it’s relatively easy to do. It’s best to work on a flat surface. There are screws on both the top and bottom blocks that must be loosened before the new spring can be inserted. The bottom block was a bit stubborn, and a jeweler’s screwdriver is essential—you don’t want to strip those tiny screws.
Use the template in the Horolovar manual as your guide. For the Kern clock mentioned earlier, I had to rely on some guesswork while waiting for the manual to arrive, but once it did, I was able to confirm the measurements. After positioning the blocks, attach the fork and secure it with screws.
Install the bottom block first. Attach the spring block to the 4 pendulum balls with the pin then lock the pendulum balls in place using the locking lever. Some 400-day clocks use a simpler bottom block solution that simply hooks the block into place. Because this one uses a pin it is a bit more frustrating. After the bottom block is secured and locked in place install the top block to the top mount by first slipping the fork over the verge post. In the case of this Kundo it is a small side screw that secures the top block to the mount (saddle?).
I then attached the dial face and the hands then gave the pendulum a gentle 360-degree spin. Not surprisingly the clock failed to maintain its spin. An adjustment was required.
Looking at the top of the clock, you’ll see a screw that can be loosened to adjust the fork in one direction or another. Be very careful not to kink the suspension spring when loosening this screw. Loosen it gently, just enough to allow movement, and make small, incremental adjustments when setting the beat. While you can buy a beat adjustment tool for 400-day clocks, with a bit of trial and error—observing the verge’s action and fine-tuning the beat setter—you’ll eventually find the correct beat. You’ll know it’s “in beat” when the time between the tick and tock is the same. At that point, the clock should run smoothly. Since the ticking is so quiet, it helps to turn off any background noise in the room while making adjustments. I have several loud-ticking clocks in my office, and I stop them to assist with the process.
If you work on enough torsion clocks, a Timetrax or similar beat amplifier will make the task much easier.
The clock has been running for several weeks and is in the process of being regulated. Above the pendulum balls in a regulating adjustment dial. You will see a “+” and a “-“. Adjusting towards the plus side speeds up the clock and the minus slows it down. I recommend minute turns for either adjustment.
There’s some debate about whether or not to oil these clocks, given the slow movement of the gears. While polishing the pivots to reduce friction can certainly be beneficial, I believe a bit of pivot oil is never a bad idea.
As I mentioned earlier, I’m part of the group that enjoys working on 400-day clocks, appreciating their delicate mechanisms and the satisfaction that comes with restoring them to working condition.
The clock is a 1937 Blackforest Royal Tour commemorative edition shelf clock with an 8-day time-only “plate” clock movement. Plate clock movements are so-called because they were typically used on kitchen clocks with Dutch Delft plates such as this one in the next photo.
Delft Plate Clock from Forestville
The movement is likely German and could have been made by a number of companies. There are no stamps or markings on the movement to give any indication of the maker. Canadian companies such as the Blackforest Clock Company of Toronto (the Forestville Clock Company after the war) imported German movements before the Second World War and installed them in Canadian made cases.
Grimy movement prior to cleaning
This clock had been happily running for about a year and then last week it suddenly stopped after a winding. I nudged the pendulum in an effort to make it go, checked to see if it was in beat and level but no luck. I nudged the pendulum a few more times, left it for a day or so, tried it again and still no luck. I was at the point of disassembling the movement to investigate the problem. Two days later I wound it tight and gave the pendulum a push and it sprang to life. I think I know what happened.
I thought I did a good job of servicing the movement including the mainspring over a year ago but apparently not well enough. You may have heard the expression, “you overwound the clock so that’s why it stopped”. There is a grain of truth in the expression because if you wind the spring till it winds no further the mainspring is at it tightest. If there are dirt, grime and rust on the mainspring the mainspring will actually cease in place, hence the clock stops. I believe this is what occurred in this case. Although it is running now it will need to be properly cleaned. In the meantime, I will let it run and see if it completes its full 8-day cycle.
This weeks goodwill find. It was 10.00 but it had a blue sticker on blue tag day so it cost 5.00
Unknown mantel clock
Clock owner posted his excellent find on a popular social media site. Here is the conversation.
Person 1, “Can’t lose at that price. Hermle movement I presume.”
Clock owner, “Yes with a quartz battery operated time train. The gong and chime are wind up”.
Person 2, “Cool. What do you mean ?? Pic of movement ?”
Person 3, “Yes, how does that work? very curious.”
No answer from clock owner and no photos of movement but there are two arbour holes.
In defense of the seller it could be electro-mechanical as Hermle made a few such clocks in the 1950-60s. Any thoughts or ideas? I think it has been converted.
Here is an ad for a clock recently offered on an online for-sale site. Here is the description.
The clocks dose not work it needs some work 80 dollars or best offer
And here is the image that is attached. There is only one image.
Blurred image of a mantel clock for sale. Photo not rotated, as seen on ad
Would you as the buyer even ask more questions about this clock?
Wouldn’t the seller put just a little extra effort into a good description and decent resolution images if they wanted to charge a fair price for their clock? I would be surprised if the seller gets any response from this ad.
We were making our way to Missouri after beginning our journey in Maine in early May (2017). We only had one very important stop along the way because for the past 5 years I have always wanted to see the NAWCC clock museum in Columbia, Pennsylvania. Ever since I seriously wrapped my head around clock collecting and repair my dream was to visit this museum. Getting there was no problem but Interstate traffic is truly a disaster! Unfortunately, we budgeted too little time for a thorough tour in the hour and a half we had but we saw as much as we could in that short time.
Waiting in a hot parking lot for the museum to open was not much fun. Couldn’t you just open the front doors a little earlier than 10:00am? To kill time we walked around the town of Columbia. It might be neat and tidy place and one of the “top twenty small towns to visit in America”, so the sign says, but like all small towns in America the decline is evident in the number of vacant storefronts and absence of activity in the streets.
Sign in Columbia Penn.
We finally got into the museum. We (my wife and I) were the first in and being a NAWCC member my wife and I got in free. During our time there we saw only one other couple. So, not a terribly busy time but there are likely peak periods in the summer.
I was wondering how I would describe my visit to the National Association of Watch and Clock Collectors Museum in Columbia Pennsylvania on that day in May. It was wonderful and more than I had imagined. There is simply not enough time to see everything and take it all in. The museum is very well laid out and there are displays to please everyone.
Vienna Regulator with Grande Sonnerie movement
For me the highlight has to be Engels Monument Clock (see Youtube video below). There was only ourselves and one other couple at the time so we were happy that the staff were able to put on a real show for us. The staffer walked us through the history of the clock and followed with a fascinating demonstration. AS he did so I imagined what it must have like to attend a local fair and see this wonderful clock in action. The clock was exhibited around the country for 74 years and last displayed in 1951 at the Ohio State Fall.
There is an emphasis on American clocks as you would expect but there are excellent examples of French, German, English and Japanese clocks. There is a broad selection of tall case clocks all the way back to the 1700s The history of time was very interesting as are the interactive displays which I am sure would please any children visiting the museum.
In a later article I will post more photos.
Whether you are an avid collector or merely have a casual interest in clocks this is great place to visit.
Understanding the role of the clock key is essential for proper clock maintenance and operation. The clock key not only winds your antique or vintage clock but also plays a crucial part in ensuring it runs smoothly and efficiently. However, using the correct size key is just as important as the key itself. Using the wrong size can lead to damage or improper winding, affecting the longevity and performance of your clock.
In this article, we’ll explore the purpose of the clock key, why choosing the right size is vital, and provide a helpful chart to guide you in selecting the correct key for your clock.
Winding Mechanical clocks
Mechanical clocks require periodic winding. Some clocks need to be wound daily, such as 30-hour clocks, while others are wound once a week (8-day clocks). Some clocks run for 14 days, and anniversary clocks can run for up to 400 days on a single winding.
Most mechanical clocks have a winding hole located on the dial face, where the clock key is inserted. The key should fit snugly—neither too tight nor too loose—ensuring smooth operation when winding.
Why Key Size Matters
Except for the smaller regulating arbour on some clock faces, most winding arbours or winding points are the same size on the clock. This means one key will fit all of them. However, over time, a clock’s original key may go missing. If this happens, you can often use a key from another mechanical clock, and one of them will usually fit.
A micrometre is a useful tool to measure the thickness of a winding arbour. However, measuring the arbour’s size often requires removing the clock movement from its case. Once you’ve measured, you can order the correct key online.
Using a micrometre to check pivot diameter; this tool can be used to measure the thickness of a winding arbour
Different Types of Keys
In general, larger German movements use a #8 key, though some require a #7 key. Many 31-day clocks, or clocks made in Korea or China, use a #6 or #7 key. Many American mantel clocks require a #5 or #6 key.
Keys come in all shapes and sizes. In the photo below are keys from German and American movements. The two-pronged keys (4 and 5 prongs) are available at any clock supply house such as Perrin or Timesavers and will fit many clock winding arbours. Many other sizes can also be ordered. eBay, online marketplaces and antique stores are other sources for clock keys.
4 and 5 prong keys and singles
In the photo below you can see two types of double-ended keys
Double-ended keys
The one on the left is used for winding a typical American clock. The large end fits into the winding arbour while the small end is for adjusting the speed of your clock. Many clocks have a smaller arbour used for adjusting the speed of your clock and will have “S” and “F” (Slow/Fast) inscribed on the dial generally near the 12 o’clock position.
The key on the right is for a time-only carriage clock. The small end is used to advance the minute hand and the large end fits onto the mainspring arbour.
Speed adjustment arbour requires the small end of a two-ended key
Grandfather and Ogee Clocks
30-hour weight-driven Ogee clocks typically require a #4, #5, or #6 crank key. Many grandfather clocks use a #10 or #11 winding crank, and it’s important not to wind them with a conventional clock key. For clocks with weight cables, the winding crank is essential for raising the weights. Insert the crank into the arbour and carefully wind the weights up until they reach the top of the clock, ensuring they remain fully visible.
Some clock keys will also have a number stamped on them indicating their size.
Storing Your Clock Key
It’s important to keep your clock key in a safe, easily accessible place. Keys should be stored either beside the clock, within the front access door of a wall clock, or in a caddy inside the case. Mantel clocks with key caddies can be inconvenient, as you must move the clock to open the back door to access the key. However, for homes with small children, keeping the key in its caddy helps ensure it remains out of reach.
Key caddy behind the access door
Key Size Chart
Here is a chart that lists key sizes in millimetres for both American and Swiss movements, from small to large:
Key Size
American (mm)
Swiss (mm)
5/0
1.6
1.25
4/0
1.8
1.5
3/0
2.0
1.75
2/0
2.2
2.0
0
2.4
2.25
1
2.6
2.5
2
2.8
2.75
3
3.0
3.0
4
3.2
3.25
5
3.4
3.5
6
3.6
3.75
7
3.8
4.0
8
4.0
4.25
9
4.2
4.5
10
4.4
4.75
11
4.6
5.0
12
4.8
5.25
13
5.0
5.5
14
5.2
5.75
15
5.4
6.0
16
5.6
6.25
17
5.8
6.5
18
6.0
6.75
19
6.2
7.0
20
6.4
7.25
21
6.6
7.5
22
6.8
7.75
23
7.0
8.0
Winding crank in a miniature Vienna Regulator
There is no key required for weight-driven clocks that have weight chains. Winding involves pulling the weight(s) to the top of the clock once each week.
Choosing the correct clock key is essential for the proper functioning and longevity of your mechanical clock. Whether you’re winding an antique mantel clock, a grandfather clock, or a time-only carriage clock, using the right key size ensures smooth operation and prevents damage to the movement.
With a variety of key sizes available, understanding your clock’s requirements and keeping the key in a safe, accessible location will help you maintain your timepiece in excellent working condition. By following the guidelines and chart provided, you can confidently select the correct key and enjoy the reliable performance of your clock for many years to come.
Would you like to tell the world about your special clock?
Would you like to tell the world about your special clock? Is it a clock you have had for years or was it handed down to you or you did you win it an an auction or find it in a dark corner of an antique store?
Is it a favorite clock you would like to see profiled on this blog? It could be one of the clocks in my collection or it could be one of your own (or several that you own). If you would like to profile your own clock(s) send me as many photos as you can (1 meg each is fine) but include shots of the movement as well. If I use your photos I have your permission to post them. If you are using photos that someone else took (Google or eBay for example) it becomes more problematic from a copyright perspective.
Circa 1890 French Black Marble time and strike desk clock
I will keep your name and location private
Provide me with a history of the clock and/or some interesting details that I could include in the blog article and let me know if you want your name included. If not I can assign an identifier, the first and last letters of your name and of course I will keep your location private.
German box clocks are quite common. Prices for these clocks are all over the map, some ask hundreds of dollars but they can be had for very little money like this Mauthe box clock I picked up in a flea market outside Peterborough Ontario. The hands were faded and the case was in rough shape but I knew it was a good deal.
Mauthe box clock, as found
Thousands of German “box clocks” were made in the first third of the 20th century and even to the middle of the century. The box clock replaced the classic “Vienna Regulator” after the First World War and reflected a minimalist approach to clock design. Most, if not all, were made in Germany. Despite the absence of markings, I have no doubt that this clock was made in Germany by Mauthe.
This vintage clock is 29 inches long by 13 inches wide and 7 inches deep. It has a 7-inch silvered Arabic dial with a spade hour hand and speared minute hand. The lower section of the case door has 5 beveled glass panels (middle one is arched) with brass connecting strips. There are two fluted columns that frame either side of the door and circular glazed viewing panels on each side. The movement is mounted and secured by thumbscrews on a seat board. The clock case is in fair to good condition with no gouges, deep scratches or missing pieces. Refinishing at some point in its life combined with environment factors has resulted in a darker walnut shade. The case is made of cheaper pine rather than the more expensive oak found in higher end box clocks.
The door has its original glass, catches, hinges and swings very easily. There are no case stabilizers (stand-offs) which I found curious given the height and weight of the clock. It has a rod gong twist locking feature about one third up from the longest rod to secure the rods during transport. Rods are brittle and can easily snap off if unsecured when moving the clock.
Rod twist lock to secure the rods during transport
I would comfortably date the clock to the 1930s
The dial face has been “messed with” in some fashion. I suspect someone tried to clean the face with an abrasive cleaner as there are scratches on the numerals. The numbers were touched up with flat black acrylic metal paint. Evidence that it was distributed by a Canadian clock company is a maple leaf applique on the crown.
Maple leaf applique and Divina gong
The five-point maple leaf is a common symbol for Canada. There are two possibilities. It might have been sold by the Forestville Clock Company of Toronto or Eaton’s department store under the Solar (Soler?) brand name. I would date the clock to the 1930s.
The price was right so I bought it
The rack and snail, time and strike, spring powered movement with recoil escapement has no markings but for the numbers 42 (pendulum length in cm) and 105 (beats per minute), the letters C,A, with numbers, 79/9 engraved in the lower right of the front plate, presumably a clock-makers mark for servicing in September of 1979 and a serial number, 25226. The back plate is solid brass while the front plate is open. It also has a repeater function on the strike side.
Mauthe movement front plate
This is an antique mall find and the seller left a note saying that the clock required servicing (code for not running). While on the wall in the store the clock ran for a few seconds and then stopped. So, yes, it needs servicing. The price was right so I bought it.
Mauthe movement back plate
I took the movement out of its case, inspected it and found it very clean. I looked for any obvious signs of wear or damage such as bent arbors or broken teeth and found nothing. The pivots holes were dry though absent of the tale-tell signs of thick black or green oil indicating wear. The mainsprings were wound tight as I would have expected. I oiled the movement, ran it outside the case for a few hours, returned it to its case, re-positioned the 3 strike hammers for the rod gongs and it ran strong, striking as it should on the hour and half hour.
The 3-rod “Divina gong” was, according to the standard German reference, Hans-Heinrich Schmid’s (2005) Lexikon der Deutschen Uhrenindustrie 1850-1980, a Mauthe trade-name registered in 1912. I compared the movement to similar Mauthe movements online and but for minor details it is the same. The case design is plain and free of decoration and is quite unremarkable save for the aforementioned beveled glass panels.
Divina rod gong, patented by Mauthe in 1912
I refreshed the case by first giving it a good cleaning with Murphy’s Soap. The cleaning revealed some light and dark patches so I opted to give the case a light coat of walnut stain followed by Poly Wipe Satin clear coat.
Box clock after case cleaning and refresh
There is not much I could do with the unsightly black smudges on the dial without lifting the silvering so I left that untouched but it still retains that vintage look.
Repainted numerals and hands
There were a number of unsightly black marks on the pendulum bob that I cleaned up using Brasso. Brasso was also used to clean up the brass bezel. The beveled glass and the brass strips were cleaned as well.
The Divina rod gong bim-bam strike has an especially pleasing resonance that echos through the house.
For a 50CDN investment the result after a refresh, is remarkable. It shows very well and it is a welcome addition to my growing clock collection.
Do you like the challenge of working on a mechanical clock? This one might have you ripping your hair out. These are not the best clocks to start on and can be a headache for the experienced clock-maker.
You will find Part I of this project here and Part II, here.
#1 Refinishing the case while movement is on the test bench
In August 2015 I wrote, “This a good project clock that is not for the inexperienced. As I gain more knowledge I will tackle this fascinating clock.” Well the time is now
With a little experience under my belt it time to tackle this vintage circa 1931 Sessions Westminster A chiming clock.
I had removed the movement from it’s case in 2015 to replace a bad click since the mainsprings can be easily removed without dis-assembly. The click holds the tension or power of the mainspring and is identified by a clicking sound when the key is turned on the winding arbour. Although I have not run the clock much since then the click is holding up well.
#2 Six bushings on back plate, 7 total (one not shown)
The movement required a total of 17 bushings. There was some movement of the pivots in the pallet arbour bushing holes, not enough to be overly concerning but they were addressed during servicing.
I was unable to pull the centre cam off because I do not have a puller which was unfortunate as the hole might have called for a bushing.
#3 Centre shaft cam
#4 Gathering pallet pins, also showing two racks
I was also unable to pull the arbour for the gathering pallet pins. It also might have needed a bushing though luckily I was able to bush one end. I mentioned in Part II that parts that are pressure fit on any movement are frustrating when said parts cannot be removed without special tools. Fortunately I was able to hand pull other chiming/striking parts off this movement.
#5 All parts in except the minute / hour canon
#6 Old spring on rack and new brass spring ready for the second rack.
There are two racks on this clock (see photo #4). One rack was missing it’s retaining spring. I made a new one out of brass wire. The clock was not striking properly and this small, seemingly inconsequential part might be the reason.
It shows very well for a vintage 86 year old clock
Between re-assembling the movement and testing of the time side I had an opportunity to address the finish on the case. I used a wood stain to hide scuffs and nicks, applied 5 coats of Minwax Satin Wipe-on Poly using 1500 grit emery cloth between coats to bring up the finish. Although not quite the deep luster of a clock coming out of the factory it shows very well for a vintage 86 year old clock. Purists might argue that I am using a modern finish on a classic clock but I don’t mind since the clock was found in a dusty old barn and cost me only $25.00.
Robert Croswell’s guide for the Sessions Westminster A clocks is excellent
The dial bezel was polished using Brasso.
#7 Re-finished case
Five Days Later
The clock has been running for a few days and I am satisfied that the time side is functioning well. I can now proceed with the strike and chime side, following Robert Croswell’s excellent manual.
One Week Later
The time is running well and I am getting a full cycle (8 days+) however I am still having issues with the strike side. It manages the quarter hours as it should, 4 strikes on the quarter, 8 on the half, 12 on the three quarter and 16 on the top of the hour. However it is obvious (to me) that I do not have the hour strike sequence set up properly. Robert Croswell’s guide for the Sessions Westminster A clocks is excellent but I am having difficulty understanding how the racks, and there are two, and the snails, again two, are set up.
Stay tuned, I know I will solve this little annoyance eventually.
In a precious article I wrote about my frustrations getting this clock to run reliably. No matter what adjustments I made it ran poorly.
“You’ve got to be very careful if you don’t know where you are going, because you might not get there”, Yogi Berra
This time and strike movement (Hermle?) has been out of its case and lying in drawer for the past year or so. When I met the seller in a parking lot some time ago as I handed him $20 for this Dugena mantel clock he climbed into his car he said, “I hope you don’t expect much for $20; it’s not perfect”. Well, it’s not perfect.
It was keeping poor time, losing an hour or so a day but I thought, what a great clock to practice on and practice I did.
Oiling the movement had no effect. Issues? A weak spiral spring, a worn jewel on the floating balance, a power issue associated with a weak mainspring or perhaps pivot wear. I disassembled the movement several times and serviced the mainsprings. I had an issue re-hooking the strike side mainspring and so, discouraged, I put it aside.
Dugena time and strike German made mantel clock
Dugena – is it a clock company?
Dugena was a German retail clock name only, a marketing name, not a maker of movements or cases. Dugena was a registered cooperative society, a “Genossenschaft”, that bought clocks from other makers to sell them under their own brand. A brand name for a retail chain more or less.
Dugena floating balance
The clock runs slow, this bent spiral spring does not help
Floating balance clocks are much more accurate and above all, they do not have have the disadvantage of the pendulum; these clocks work even when the case is at an oblique angle
A great invention – the floating balance
The floating balance movement in this clock could have been made by anyone; Urgos, Jauch or Hermle perhaps. Hermle is likely since it was one of the leading companies using the floating balance escapement. The floating balance was invented in the 1930s but it took till 1941 for the patent application to be registered. It took another 10 years after that for the patent to be granted slowed by the war years and the challenges of industry recovery following the Second World War.
The floating balance was a great invention. Floating balance clocks are generally more accurate and above all, they do not have have the main disadvantage of the pendulum; they will work even when the clock case is at an oblique angle.
Time and strike movement, maker unknown
Back to the the clock
Months passed. I took the movement out, looked at the strike side barrel a second time, popped the barrel cap off and using pliers gave the inner part of the mainspring a turn and it hooked onto the catch. Success at last. The mainspring barrels can be removed without dis-assembly of the movement, so, in it went. Despite my minor triumph with the strike-side mainspring, straightening the spiral spring and adjusting the balance wheel to its fastest set point, the clock ran only marginally better. The only consolation is that although it runs 5 minutes slower per day it runs a full eight day cycle.
Despite the minor disappointment it has been a productive learning experience but I am inclined to put it aside as I have other projects on the go. Every time I think about the issues I am having with this clock it always comes back to the balance wheel.
Antique and Vintage Mechanical Clocks 
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