Seth Thomas Tambour Mantel Clock with Quarter-Hour Strike, 1930s

This Seth Thomas tambour mantel clock with quarter-hour striking was made around the 1930s. The case is 17 1/8 inches wide and 9.5 inches tall. The minute hand is 2 5/16″ from center to tip. The dial is aluminum with printed on numerals.

This clock strikes bim-bam once on the first quarter, twice on the second quarter and three times on the third quarter. On the hour it strikes the number of the hour on a single note.

See more pictures.

Repair job 7009. This movement, No. 89 L, says “PAT APPL’D FOR” at the upper left of the back plate. The strike mainspring is original and is a nice, thin 3/4″ x 0.0165″ spring. The time mainspring was a replacement made by “Usibel France” and was a too-strong 0.0182″ thick. I replaced it with an R & M 3/4 x 0.0176 x 120″ mainspring (note: this was back in 2017, now I recommend the German-made 11/16″ x 0.015″ by 108″ spring, such as the MS298 from Merritt’s).

I polished the pivots and installed 17 bushings. There was no wear to the strike mainwheel teeth, and the time mainwheel had only 3% wear, in spite of the very strong replacement mainspring. It probably didn’t run long after that previous repair job, thankfully.

Share this post:


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.