If you have a favorite clock in your collection that has earned a special place in your heart, we invite you to share its unique story with our readers. Whether it’s a vintage masterpiece or a modern marvel, we want to unravel the essence of what makes your clock truly exceptional. Provide me with a history of the clock and/or some interesting details that I could include in a blog article. The only identifier will be the first and last letters of your name and your country location.
I recently received a letter from D in South Africa, requesting assistance in gathering information about a particularly cherished clock that has been a part of his family for many years. D has graciously given consent for me to feature and profile this special family clock on my blog.
D writes
I hope you don’t mind me reaching out to you. My family has an Empire-style anniversary clock that I believe is rare and I am struggling to find any information, relating to its age, maker, or “story”.
It has been such a part of our family and I regret not exploring the history while family members were still able to shed some light on its origin… A local clock expert has suggested it was possibly made in the early 1900s in Germany…I contacted Martin Haller who confirmed it was not made by them.
Dial faceUnique pendulum
I believe the clock was imported to South Africa by J Muller (a jeweler)who was originally from the Black Forest in Germany and their family became well-known optometrists here in Cape Town. I think they gifted it to my great-grandparents before the First World War. If you perhaps have any information about the clock I would be most grateful. Many thanks, D
Backplate
I was intrigued by D’s clock and decided to do a little digging
My reply
Hi, and thanks for your email, D. First of all, it is a fascinating clock and, in my view, quite rare. Time is the enemy of memories and once the memories are lost, they are lost forever. I know very little of the history of most of the clocks in my collection, unfortunately, but it is nice to learn that your clock has been in your family for such a long time. At least you can trace most of its history.
The photo of the face is a bit blurry but the names on the dial face of a shelf clock such as yours are usually the retailer or a dedication to an individual. I assume there is no maker’s stamp on the movement.
A Haller clock would have been an excellent guess, but I think not.
The plate image of your clock can be found in the Horolovar manual. The Horolovarmanual is an indispensable resource for anyone working on, or collecting torsion clocks.
I have attached two photos from the Horolovar manual, a guide to the repair of 400-day and similar torsion clocks to aid in identifying your clock. Yours has Jahresuhrenfabrik c1902 plate 1471 (see photo). Angemeldet means declared; a “declared patent”.
The backplate of the anniversary clock
I discovered that the clock was designed by Andreas Huber.
Andreas Huber twin-loop temperature compensating pendulum
The patent for the movement is dated 1902. Your clock was likely made shortly after that date. While the clock case radiates regal elegance, it is the pendulum that is its most intriguing feature. The pendulum is unique because it is twin-loop temperature-compensating to maintain accuracy throughout its running cycle. A type not found in many anniversary clocks.
Two companies purchased movements from Andreas Huber, Badische Uhrenfabrik, and the more widely known Kienzle, both of Germany. It is also quite possible that Huber sold to other companies such as Schatz or Gustav Becker, but I have found nothing to confirm that.
You have a unique clock and, who knows, a reader somewhere in the world might provide more information so that we can both learn more about this fascinating clock.
Let me start by saying that opinions on torsion clocks are divided—some people have great success with them, while others absolutely loathe them. Despite their seemingly simple design, they can cause endless frustration, which is why many clock repairers tend to avoid them. Fortunately, I seem to be one of the lucky ones.
TheKundo Standard size 400-day clock wound once per year
I gifted this clock to my daughter three years ago. She chose it for its intriguing visible movement and the convenience of running an entire year without winding. Recently, she moved across the country, and during the relocation, the clock “broke.” “Can you fix it, Dad?” she asked. “Leave it with me,” I replied.
400-day clocks, also known as torsion clocks, have been around for over a century. They were first produced in limited numbers in the mid-1890s, but their popularity surged after 1900. Between then and the 1980s, thousands were manufactured, becoming a favorite choice for wedding and retirement gifts—hence the nickname “anniversary clock.”
The Kundo model featured here dates back to the late 1950s or 1960s, during the height of production. However, with the advent of quartz clocks, mechanical versions quickly fell out of favor.
Kundo is a well-known name in the world of anniversary clocks. The name is a combination of Kieninger and Obergfell, a highly respected German company. Today, the company continues as Kieninger, operating as a subsidiary of Howard Miller USA.
Dial face, Kundo Clock
Servicing a 400-day Clock
To service a 400-day clock, I highly recommend using the Horolovar 400-Day Repair Guide as a reference. Can you repair a 400-day clock without it? Yes, but the Horolovar guide eliminates almost all the guesswork.
This particular 400-day clock is a Kundo Standard 53, which requires a .0032″ (0.081mm) Horolovar spring. If you don’t have the time or tools to assemble the suspension units yourself, Horolovar (or most clock suppliers) offers fully assembled units. However, these come at a significantly higher cost.
Section 10 of the Horolovar guide includes templates for various clocks. These templates provide precise patterns for positioning the fork and attaching the upper and lower blocks to the suspension wire, ensuring proper assembly.
The suspension spring assembly includes the top and bottom block plus the fork
The screws on the suspension assembly are very small, so using a high-quality precision screwdriver is essential to avoid damaging them. The suspension spring is longer than needed and will require trimming to fit. Once the spring is securely attached to the fork and blocks, it’s ready to be reinstalled onto the movement.
Kundo anniversary clock movement
The suspension spring assembly hooks onto the top cock and bottom weights or balls. A threaded thumbscrew on the top base slips into the top block. The bottom block has two pins to which the pendulum hangs. Next are the back spring cover and the locking guard.
Torsion clocks have pendulum locking systems that must be engaged even when the clock is moved just a few feet. Often, the result of an unlocked clock is a broken suspension spring. The locking guard on this clock is an earlier design and looks pretty flimsy in my view but it should work.
Once the spring assembly is installed on the movement it is time to test the beat. The beat should be 8 beats per minute and there should be ample overswing in both directions. A 270-degree rotation is healthy enough.
What makes the 400-day anniversary clock a great addition to a collection?
They are:
Relatively inexpensive to buy, although some models like Schatz and Gustav Becker are more sought-after and therefore more expensive.
Very quiet in operation.
Easy to disassemble, clean, and reassemble due to having few parts.
Slow runners, meaning wear is rarely an issue.
A fantastic conversation piece.
Long runners, with some lasting 400 days or more on a single wind.
What makes them less ideal:
Notoriously inaccurate timekeepers.
Can be frustrating to fine-tune at times.
Since I had previously serviced this clock, I was able to loosen the tiny screws on the blocks and fork with ease. Sometimes they can be tight and difficult to remove, but on this occasion, everything went smoothly. As of this writing, the clock has been running well for several weeks.
While it’s currently running slightly fast, small adjustments to the regulating dial will slow it down. However, there’s a limit to how much you can adjust, and it’s not a clock I would rely on for precise timekeeping.
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.
Clocks have been more than just timekeepers throughout history; they are reflections of art, culture, and technological innovation. Whether for practical use or decorative appeal, clock styles have evolved to match the tastes, craftsmanship, and technologies of their times. Here’s a look at some of the most iconic and varied clock styles.
The clock is an instrument designed to keep and indicate time. It is one of the oldest human inventions. The clock has evolved through the ages from sundials in ancient times to early tower clocks of the 14th century weight-driven clocks and finally spring-driven clocks from the 1840s to the 1970s.
The world of mechanical clocks encompasses a wide variety of styles, and distinguishing between them can often be confusing—such as understanding the difference between a shelf clock and a mantel clock. In this article, I’ll navigate through these terms and highlight the most common styles or types, using examples from my own clock collection to illustrate them.
Mantel Clock
Many auction sites and even professional websites use the word mantle. The correct terminology is “mantel”. A mantle is a shawl or coat worn by women, an important role passed on from one person to another or the earth’s crust. A mantel is the top framing of a fireplace or a shelf above a fireplace opening.
A mantel clock is designed to fit on top of a fireplace or shelf. A mantel clock can be time only, time and strike, or a chiming clock. Generally, if there are 2 winding arbours it is a time and strike clock, if the clock has 3 winding arbours is it a chiming clock that is, it will play a tune on the quarter hours, the most common being the Westminster chime.
Mantel clocks might also be referred to as shelf clocks or buffet clocks.
Kitchen Clock
Arthur Pequegnat kitchen clock
Kitchen clocks are often referred to as gingerbread clocks or parlour clocks. At times, it can be difficult to differentiate between a kitchen clock and a parlour clock. Gingerbread clocks are distinctive because their designs are typically created by steam-pressing the wooden front face. However, some clocks, like the one above, are made using a powered cutting saw but are still classified as kitchen clocks. Additionally, some of these clocks included alarm mechanisms. The terms gingerbread, kitchen, and parlour are often used interchangeably.
Another type of kitchen clock is shown below. This is an 8-day time-only delft wall clock made by Forestville.
Delft Clock from ForestvilleE. N. Welch Whittier model
A parlour clock is generally considered more ornate than a kitchen clock, although it may still be referred to as a kitchen clock. It is placed in front hallways, entryways, and so on. The designs are always cut and there may be finials, a mercury-filled pendulum or very ornate design, garish trim pieces, and a decorative tablet.
Vienna Regulator
Gustav Becker two-weight Vienna regulator
There are many styles but most are of the single-weight or two-weight variety. The definition of a Vienna regulator is always open to debate but the consensus among collectors is that they are weight-driven, made in Austria/Germany, ornate in design, have porcelain dials, decorative crowns, large pendulums, and finials on the top and bottom.
The broad definition of Vienna Regulator includes those that are spring-driven. Though not defined as “regulators” it is acceptable among collectors to refer to them as a Vienna style.
Cottage Clock
Canada Clock Co Hamilton Cottage Extra
Sometimes called a mantel clock or a shelf clock, they are usually diminutive in size to occupy a smaller space. They are found in bedrooms and kitchens and are sturdily built since they are often designed to be portable. They come in time only, time and strike, or may have an alarm function.
Carriage Clock
French Carriage Clock
Carriage clocks are portable and were very popular around the turn of the 20th century. French-made carriage clocks are more collectible and fetch generally higher prices although American ones can be quite desirable. Carriage clocks are designed to be portable and are time-only but some are time and strike (with a repeater function) while others may have an alarm function.
Crystal Regulator
Ansonia Crystal Regulator
Crystal Regulator clocks are identified by a brass case with 4 crystals or glass panels. Porcelain dials, Roman or Arabic numerals, ornate in design but sometimes quite garish. Most are 10-12 inches in height though some are smaller. Makers are American and French though French crystal regulators are called four-glass clocks and tend to have higher value. Distinctive by their mercury or faux mercury pendulums. Some have visible Brocot escapements and the time and strike movements are always visible.
Cuckoo Clock
Cuckoo clock
These clocks are pendulum-regulated and make an automated sound like a cuckoo when it strikes the hours. Some can be very intricate with several animated characters. Desirable ones are antiques from the Black Forest region of Germany. Modern ones are generally frustrating to repair, cheaply built, and are poor timekeepers.
Lantern Clock
Converted lantern clock
A lantern clock is a type of antique weight-driven wall clock, shaped like a lantern. They were the first type of clock widely used in private homes. They probably originated before 1500 but only became common after 1600 and in Britain, around 1620. They became obsolete in the 19th century. The one pictured above has been converted into a fusee movement.
Alarm Clock
Baby Ben alarm clock with seconds hand
Alarm clocks are wound once per day and designed to do two things, wake you and display the time. They are cheap, and are average timekeepers but have long-lasting and reliable movements.
Desk Clock
Kienzle World Time clock
These sat on fancy office desks or credenzas in office locations. They are either time-only or time-and-strike. Most were time-only to minimize distractions in the office environment. Some are very attractive and have unique designs and are more decorative than utilitarian. This one above is called a World Time Clock by Kienzle.
Wall Clock
German Mauthe Box clock
A wall clock is broadly defined as any clock designed to be hung on a wall, making it a practical and visible timekeeping solution. Wall clocks come in various styles, from simple and functional designs to highly decorative pieces. This one by Mauthe is often described as a German “box” clock which became popular after the First World War and made into the 1940s.
Schoolhouse Clock
Ansonia schoolhouse clock
They are known as schoolhouse clocks because they hung in many schoolrooms in North America. Usually distinctive by their octagon shape and short or long drop feature with a glass door displaying a swinging pendulum. Many thousands were made; they had cheap mass-produced softwood cases and robust movements. Most were time-only though some were time and strike and others even included a calendar function.
When they were marketed years ago they were not called “schoolhouse clocks” but rather, clocks made for the schoolroom.
Novelty Clock
Chairman Mao Zetong waving as the clock ticks
These clocks are designed for the tourist trade with interesting features. In the case of the above clock, a smiling Mao Zedong has his little red book in hand and is waving “to the masses” as the clock ticks.
Ogee Clock
Waterbury OG clock
It is so-called because of the curved molded wood case. It might also be referred to as an OG clock. The design originated in the United States in the 1830s, distinguished by a case (usually pine) the front outer edges of which are curved into an S-shape (Ogee). This shape is formed by the union of a convex and a concave line. A mass-produced variant of the shelf clock, the Ogee clock typically stands about 30 inches (75 cm) high and is usually weight-driven. The movements were generally made of brass (earlier ones were made of wood) and ran for 30 hours or eight days. This is a 30-hour weight-driven version from the 1870s.
Tall Case Clock
Ridgeway Hamilton Country, Westminster chime
Tall case clocks are known by various names depending on the region. They are referred to as tall-case clocks in American terminology, long-case clocks in British terminology, hall clocks in Canada, and sometimes as floor clocks. However, the most commonly used term is “grandfather clock.”
They are usually weight-driven, with the weights on chains or cables, and are distinctive by their obvious height. They are always 6 feet or over but can be as high as 8 feet high (1.8 to 2.4 meters). They often feature elaborately carved ornamentation on the hood (or bonnet), the frames, the throat, and the dial or clock face. Older ones have 30-hour movements but all modern grandfather clocks run on an 8-day cycle.
Smaller clocks are called grandmother and granddaughter clocks. They are under 6 feet.
Anniversary Clock
Kundo standard size 400-day clock
These clocks are also called torsion clocks or 400-day clocks. 400-day clocks are torsion driven having a long suspension spring to which a weight oscillates back and forth. Typically these clocks operate at 8 beats per minute and run for long cycles on a single wind, up to 400 days. These clocks were popular as wedding gifts or gifts to mark special occasions. They are relatively simple to repair but can be finicky to set up. The newer quartz clocks are very accurate but do not replace the charm and curiosity of the older mechanical ones.
Some might call them purely decorative.
Tower Clock
Tower clock in Holguin, Cuba
In the early 14th century large mechanical clocks began to appear in the towers of Italian cities. There is no record of any working models preceding these public clocks that were weight-driven and regulated by verge-and-foliot escapements. They are referred to as Turret clocks in the UK.
In conclusion, while there are sub-categories for some of the clocks described above, this overview provides a general understanding of the commonly used terms. Having this knowledge can be especially helpful when shopping for a special gift or identifying the style of clock you may have in your possession.
The 400-day anniversary clock, also known as long-duration clocks, is a fascinating category of clock known for its ability to run continuously for a full year without needing to be wound. These clocks, often featuring intricate designs and beautifully crafted mechanisms, were first introduced in the late 19th century and have since become a beloved collectible.
Kundo standard size 400 day clock
In this article, we’ll explore the history, mechanics, and appeal of these interesting clocks. This is a two-part series. The first part describes my most recent purchase, a 400-day Kundo anniversary clock. Part II involves the installation of the suspension spring, cleaning, testing, and post adjustments.
400-day clocks are known for their inaccuracy, although they are undeniably beautiful and fascinating to observe. A minute lost each day adds up over the course of a year, potentially totaling many minutes—or even hours—by the end. Despite this, I still find great joy in owning and appreciating them.
A brief history
400 day clocks have been with us since about 1900. There were torsion clocks produced before 1900 but in limited numbers from about 1894 onward but the real push was after 1900. The Kundo model you see here was made in the late 1950s or early 1960s, probably the peak and subsequent decline of the anniversary clock era.
Dial face Kundo Clock
Once quartz clocks were introduced mechanical versions declined precipitously. Kundo is one of many companies making anniversary clocks in the 1950s and 60s. Kundo is a combined form of Kieninger and Obergfell. The company exists to this day as Kieninger, a subsidiary of Howard Miller which is part of a larger company.
This particular clock is a good example of a typical anniversary clock of the period. There are signs of wear as one might expect, dents on the base where an unrestrained pendulum did its damage and a snapped suspension spring but all the parts are there, complete with its dome.
Dents from weights bouncing around during transit
The clock was purchased at a local antique store. It is not in running condition. These clocks typically sell for around $50 to $100 or more on online marketplaces. Domes are often chipped or missing entirely. The glass dome on this one is free of chips.
I have ordered a Horolovar spring (.0032″) and will report on the installation, cleaning, and testing of this 400-day clock. Look for the second part of this series.
My wife and I were at a little antique shop just outside Truro, Nova Scotia on a typical Sunday drive. I found a lovely Black Forest time-only shelf clock that was reasonably priced and bought it because it had a simple plate movement I was looking for. My wife on the other hand wandered through the same antique store and noticed a Kundo anniversary clock. Kundo was a well known German clock make and is otherwise known as Kieninger & Obergfell. Although we were not really in the market for an anniversary clock the price was right.
I noted at the time that it was not functioning but all it took when I got it home was a winding to get it running again and two weeks to regulate the time. Compared to those I have seen on EBay this one is in excellent condition and cleaned up well. The photos were taken prior to cleaning.
Kundo anniversary clock
A 400 day anniversary clock is otherwise known as a torsion pendulum clock. The torsion clock is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with 3 or 4 chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also known as suspension spring).
Without glass dome
The torsion pendulum rotates about the vertical axis of the wire, twisting it, instead of swinging like an ordinary pendulum. The force of the twisting torsion spring reverses the direction of rotation, so the torsion pendulum oscillates slowly, clockwise and counterclockwise. The rotation is generally 270 to 360 degrees and takes about 7-9 seconds. Mine has a little bit of over-swing which is not problematic.
The clock’s gears apply a pulse of torque (provided by a winding spring) to the top of the torsion spring with each rotation to keep the wheel going. Because they are running so slowly and require little energy, they are capable of running for long periods but are not as accurate as weight driven or other spring driven clocks due to the fact that they are subject to temperature and humidity changes and the long run periods between windings augment any inaccuracy. Mine runs within 2-3 minutes a month and most would consider that to be acceptable.
Movement and pendulum with speed adjustment dial on top of 4 spokes
An adjustment allows the balls to move in and out of its axis thereby controlling the rate of the clock. The closer the balls are to the centre of the axis the faster they will spin and further from the axis results in a slower rotation. Torsion clocks were popular gifts because they would run a year between windings thus marking an important occasion or anniversary.
Torsion clocks are usually delicate, ornamental, spring wound shelf clocks which typically stand between 9 and 12 inches in height. The polished clock mechanism is usually exposed under a plastic or glass case or dome (need not be, however), to allow one to watch the torsion pendulum turn.
Movement showing spring barrel
This particular torsion clock was made in the 1970s. Shortly thereafter production of torsion clocks began to decline. There was a minor resurgence of electronically switched electro-mechanical (battery) torsion clocks but otherwise the age of the torsion clock was coming to an end.
Torsion clocks have a long history which I will explore in a future article.
Antique and Vintage Mechanical Clocks 
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