Seth Thomas Adamantine Mantel Clock, Similar to Sussex

Here’s a pretty little Seth Thomas Adamantine mantel clock, similar to their “Sussex” model. It is black with marbleized trim, and is 10 3/4 inches tall, 11 5/8 inches wide, and the minute hand is 2 1/8 inches long. I overhauled this clock in 2006; and disassembled, cleaned it, and did a little repair work again in 2023. It had been running fine the whole time, but was getting a little sluggish.

Adamantine is Seth Thomas Clock Company’s patented celluloid finish that was applied to the wood case like a veneer. It was made in many colors including black and white, imitation mahogany, and various colors with a marbleized appearance. It is durable, but you need to be careful of the corners.

See more pictures.

Repair job 8831. I first overhauled this clock in 2006, and polished the pivots and installed 14 bushings.

In 2023 I disassembled and cleaned it, polished the pivots again, and tightened the click. The bushings had no visible wear. I’m always pleased, but not surprised, when a clock I overhauled 10 to 20 years ago comes back and needs only cleaning and minor repair work. Usually most of the bushings are fine, and I like to polish or burnish the pivots again (if needed) to keep future wear to a minimum.

This clock has the original Seth Thomas mainsprings, both are 3/4 inch wide and 0.0173 inch thick.

The movement is the No. 89 but was made before they called it that, and it is labeled “4 1/2”. This movement runs very efficiently because it has a deadbeat escapement.

The pendulum bob weighs 5.5 ounces.


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