PROFILE MY CLOCK: Empire-style anniversary clock from South Africa

^{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.

Empire anniversary clock pie crust dial face — _{Dial face}

Empire anniversary clock, pendulum design — _{Unique 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

Empire anniversary clock back plate — _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 Horolovar manual 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”.

Patent Angemeldet, image of clock plate for a torsion clock — _{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.

February 27, 2024

Kundo 400 day oval anniversary clock – let’s get this thing working!

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.

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 before cleaning — _{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.

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.

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.

suspension spring installed on a Kern — _{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.

May 6, 2018

Kundo 400 day clock and why I love anniversary clocks | Part I

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.

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.

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.

October 11, 2017

The 400 day anniversary clock

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.

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).

RS Kundo detail (2) — 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.

RS Kundo detail (3) — 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.

RS Kundo detail (1) — 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.

May 22, 2016

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