Seth Thomas Adamantine Mantel Clock, Arno, Black with Green Trim

Here’s a beautiful little Seth Thomas Adamantine mantel clock, named “Arno”, that I repaired. The clock is 11 1/2 inches tall and 12 1/2 inches wide. The minute hand is 2 1/8 inches long. The pretty case is finished in black Adamantine (colored celluloid veneer) with green top, pillars and pillar blocks.

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Repair job 7771. I polished the pivots and installed bushings. I secured one regulator gear with Locktite and tightened the click rivets. The original adjustable pendulum bob weighs 5.4 ounces.

I replaced the original 3/4 x 0.0179 inch time mainspring with a Merritt’s MS310 3/4 x 0.016 x 108 inches to reduce future wear to the time mainwheel teeth. I removed and cleaned the case ornaments and polished the Adamantine.


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