Seth Thomas Adamantine Mantel Clock with 89C Movement

March 12, 2015 | By | Reply More

Here’s a beautiful Seth Thomas Adamantine mantel clock I repaired. The case is black, with green, yellow and orange marbleized top and trim. The movement is the popular and long-lasting No. 89C (which appears to be the same as the movement marked 89 which is seen often). It strikes the hour on a heavy coil gong, and the half-hour on a bell. This example has a polished, nickel-plated bell. The bell may not be original, as almost all the others I’ve seen have an unpolished, brass bell. This movement uses an “American type” semi-deadbeat escapement.

IMG_9244 IMG_9239 IMG_9237

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Repair job 6409. I repivoted the rear time second wheel pivot (see the 2 pictures below).

IMG_9192 Repivoting process: The inserted pivot has been finished.

I polished the pivots and installed 15 bushings. I replaced the time click rivet, and the time mainspring arbor hook. This movement has the original mainsprings:

Time Mainspring: 3/4 inch wide by 0.0160 inch thick

Strike Mainspring: 3/4 inch wide by 0.0168 inch thick.

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Category: American Clock Mainsprings, American Clock Repair

Last updated: March 10, 2015

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