Here’s an Adamantine Mantel clock (made by Seth Thomas) that I’d never seen before! I would describe the case finish as “tortoise shell”. Below are photos of the front of the clock, a closeup of the case, and a photo of the rear showing the movement:
Adamantine is a veneered celluloid finish made by Seth Thomas Clock Company with various colors formed in the celluloid veneer. Common colors are black, mahogany and green; other colors such as white and various marbleized colors were also made.
(I taught my customer how to polish this case, and he did the polishing and I repaired the movement.)
This clock doesn’t have a date code on the bottom of the case, but I estimate it was made ca. 1910. It is 11 7/16 inches tall, 12 15/16 inches wide at the feet and 12 3/4 inches wide at the top. The minute hand is 2 1/8 inches long, and the dial is celluloid-covered paper.
Repair job 6621. I polished the pivots, installed 14 bushings, and replaced the click rivets to make the winding reliable.
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