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The Seth Thomas “Office No. 6″ is a wall clock in a rectangular wooden case. Time-only and time and strike versions were available. The earlier ones had a removable scroll top and a bracket base, but by 1924 it was being made in a plain case.

This example looks similar to that in the photo labeled “1924″ in Tran Duy Ly’s Seth Thomas clock book. The case is dark mahogany, 31 inches tall, 15 5/8 inches wide, and the dial has a 10 3/4 inch time track. The movement is 8-day time only, no. 123 E. I first overhauled this clock in 1999 (polished pivots and installed 5 bushings). It ran until 2009, when the click broke (an uncommon occurrence).

I cleaned the movement and did the following repairs:

• Installed a new click;
• Installed a new mainspring, as the old one had a squeaky action even after cleaning and oiling. I installed a Merritt’s P-1956 3/4 x 0.0165 x 96 inch mainspring (the new spring opened up to 5 1/4 inch diameter after being wound and unwound 5 times).
• The pivots, which I had polished during the last overhaul, were still in excellent condition.

This movement has stopworks for the mainspring, I set it up so that it stops the winding when the spring is one turn from being fully wound. The case has a beat plate, and the motion of the pendulum measured on the plate is as follows:

• Escape arc:  + and – 0.75 degrees
• Wound up: + and – 3.3 degrees
• Rundown 3 days: + and – 3.2 degrees
• Rundown 7 days: + and – 2.8 degrees

The paint on the dial was flaking badly, and the customer wanted it restored. I had it repainted by The Dial House in Dallas, Georgia.

Here is a slide show of the clock and its movement:

Repair job 1891.

The “Verdi” drop octagon wall clock was made from 1877 to 1893. From 1877 to 1885 it was made with a Welch, Spring and Company label; after that it had an E. N. Welch Manufacturing Company label. The case is rosewood veneered, 31 inches long, 12 inch dial (11 inch minute track).

This example has an 8-day time only movement driven by two mainsprings. The mainsprings are the original thick, roughly finished springs. They are in good condition and provide plenty of power to operate the clock. They are narrower than standard 8-day mainsprings, only 3/8 inch wide. They are quite thick, 0.022 inch.

The escapement is a club tooth deadbeat (or semi-deadbeat, as there is slight recoil during locking). The escapement was patented by B. B. Lewis on August 31, 1870, patent number 106,843.

The dial on this example was repainted by The Dial House, Dallas, Georgia. The second hand is a replacement.

Besides cleaning, the movement needed the following repairs:

• Tighten the click rivets;
• Polish pivots;
• Install 7 bushings;
• Replace one bent pinion wire in the second pinion;
• Replace the pinion wires in the escape wheel;
• Increase the hand set tension.

Here is a video of the escapement:

Here is a video of the case:

Here is a slide show of the clock and movement:

Repair job 5023.

Historical reference: NAWCC Bulletin Supplement Number 12, February 1978, “The Welch, Spring and Company”, by Owen H. Burt and Jo Burt.

These two “Plymouth” tambour mantel clocks made by Seth Thomas came into my shop just a couple of days apart. They are similar but have different movements. Both have lively hour and half hour strike on two chime rods.

Plymouth was a name that Seth Thomas put on some clocks ca. 1930 – 1950. If anyone has details of this, please let me know.

Our first example is labeled 89IM on the movement. This is a variation on the popular No. 89 movement having hour and half-hour strike, with two hammers that simultaneously strike on two chime rods. The date code is 37-11 which represents November, 1937. The label on the back door has the date 5/21/38 (May 21, 1938) hand written on it. This is probably the date the clock was sold.

Our second example has the later Seth Thomas time and strike movement that was introduced to save on cost. It is labeled 10-40 and 4503, which could be date codes for October 1940 or March, 1945. If anyone can help me interpret these numbers, please let me know! Similar movements have been seen with model number A-200 on them. The label says:

Guarantee and Directions
Covering Clocks Equipped With
4300, 4500 and 4600 Series 8-Day Pendulum
Strike Movements in Tambour Cases

Both cases are 20 inches wide and 9 1/4 inches tall, with bezels measuring approximately 6 1/4 inches outside diameter. Both have “fake inlay” printed on the case front. Both  have aluminum dials. The older dial has embossed numerals, but the numerals on the newer dial are printed only. Both clocks have instruction labels inside the back doors and are illustrated below.

Movement Summary

• The No. 89 movement was introduced about 1900, and was made in many variations.
• It was replaced in the late 1930s or the early 1940s with the second movement shown above. This has smaller plates and gears and was probably a cost reduction. It is not as good, as it seems to need quite strong mainsprings to run well.
• In 1955, a flood badly damaged the Seth Thomas factory. They phased out movement manufacturing and began importing many movements from Germany. They used many Hermle movements.

Many antique French clock movements are secured in the case by tension: Two screws from the back cover pull on two straps attached to the dial plate. Friction is relied upon to keep the movement secure in the case.

Sometimes the movement may rotate in the case even with the screws securely tightened. This can easily happen when winding the clock. If the movement rotates, the clock will be out of beat (not ticking evenly), and may stop or not run reliably.

One way to secure the movement is to cut 4 thin pieces of double-sided tape (such as carpet tape) and stick them to the edge of the dial pan (where the dial pan presses against the case). The movement must be taken out of the case to do this. Cut the tape to a curved, narrow shape that will not be visible when the movement is installed.

Here are two clocks I just did this to:

The Seth Thomas “Helmsman” ship’s bell strike clock has been popular for many years. It was introduced in the late 1950s or early 1960s, and made into the 1980s or longer.

Seth Thomas "Helmsman" ship's bell clock

The Helmsman uses a movement made by Hermle in Germany. The movements made in the 1960s have the patent number 2,974,473 stamped on the back plate. The patent describes a system for doing the ship’s bell strike. See this web page for strike examples. Ship’s bell striking operates on a four hour cycle with pairs of bell strikes on each hour, and pairs of strikes plus a single strike on the half hour:

12:00 XX XX XX XX

12:30 X

1:00 XX

1:30 XX X

2:00 XX XX

2:30 XX XX X

3:00 XX XX XX

3:30 XX XX XX X

4:00 XX XX XX XX

and so on, repeating every 4 hours.

The inventor of the patent is Richard Kramer, and the patent was assigned to General Time Corporation (parent company of Seth Thomas at that time).

The fact that General Time, and not Hermle, received the patent, leads me to believe that this movement was specially made for Seth Thomas. Later, of course, other companies used this movement in their clocks (including the Chelsea “shipstrike” clocks).

One interesting feature of Kramer’s design is that a “dummy” strike without the bell is performed at 15 minutes before the hour. This prepares the strike for the next hour, when 1, 2, 3, or 4 pairs of strikes are sounded. In later years, the design was changed, and the “dummy” strike cycle was eliminated.

I recently repaired the movement of this Seth Thomas 8-day OG shelf clock.

Before repair, the clock would run for several minutes and then stop. While running, it would go in and out of beat (the ticking would sometimes be even and sometimes uneven).

The movement was taken apart and cleaned. The major problem was that some of the escape wheel teeth were non-uniform. I used the Webster escape wheel tooth straightener to ensure that all the teeth were at the same angle. The wheel was mounted in the lathe and the teeth bought to a uniform height, then the burrs were removed. The pallets were polished, the worn pinion wires in the escape wheel pinion were replaced, the pivots polished, and bushings installed in the worn pivot holes.

The following video shows the escapement action before and after repair:

The following video shows the movement in the case and shows the hour striking:

It is possible that the movement is not original to the case. We suspect this for two reasons:

• The pendulum bob is quite low in the case;
• The end of the center arbor touches the glass when the door is closed.

The movement is labeled “Plymouth” which means that it was made in 1865 or earlier when the town where Seth Thomas was located had the name “Plymouth Hollow”. It 1865 the town name was changed to Thomaston to honor Mr. Thomas. The case label says “Thomaston” so this could be a transition clock made around 1865, or it could be a later case with a older movement. The reverse painted glass is not original to the case, it appears to be a New Haven multicolored glass.

The weights are replacements, weighing as follows:

• Time weight: 8 pounds 1 ounce
• Strike weight: 6 pounds 9 ounces

Repair job 5064.

I recently repaired a Seth Thomas Adamantine mantel clock made around 1905. It has a No. 89 movement. This movement is very efficient in operation, due to the use of a deadbeat escapement. Even with a thin time mainspring, these movements typically take an excellent escapement motion.

This particular example has thin, original mainsprings.

Time Mainspring: 3/4 x 0.0167 inch.

Strike mainspring: 3/4 x 0.0163 inch. (Unfortunately, I had to replace the strike mainspring because it had a rough action when nearly wound, typical of springs that may break soon. I used a new Merritt’s Antiques P-1956).

Many examples of the No. 89 movement have thicker springs, quite often around 0.0175 inch thick, sometimes thicker. After proper repair, this movement will run well with thin springs.

Here is a video of the escapement motion, first run down 6 1/2 days, then fully wound:

Repair Job. 4970.

I thought it would be fun to show all the parts of this movement. In the first photo it has been disassembled and is ready for cleaning. You can tell it needs cleaning by the black deposits on the pivots (the ends of the gear shafts that turn in the holes in the brass movement plates). Many of the parts are strung on wires for convenience in cleaning. Parts such as the hands, chains and hammer heads are not put in the cleaning fluid.

This movement plays Westminster chimes on each quarter hour, and strikes the number of each hour after the hour chime. The time gear train is in the center, chiming on the right, and hour striking on the left. A clock that chimes has about twice as many parts as one with just hour and half-hour striking.

Many of the pivots needed polishing to remove wear, and I installed 19 bushings to correct for wear in the pivot holes.

The movement is labeled at the bottom:

Gravely Furn. Co. Inc.
Martinsville, VA USA
Made in Germany
No ()) Jewels
Unadjusted
PL 85 CM

This movement goes to a Ridgeway grandfather clock.

Repair job 4968.