Here is a beautiful Seth Thomas Adamantine mahogany mantel clock. It is a cute little clock with one celluloid half-pillar on each side of the front. It is in excellent original condition. It strikes the hours on a heavy coil gong, and strikes a single note each half hour on the brass bell. It is an 8-day clock and has the popular and reliable 89C movement.
Repair job 6432. I replaced the click rivets (they were loose). I polished the pivots and installed 18 bushings. The original mainsprings are nice and thin, yet provide plenty of power to operate the movement.
Mainspring Dimensions (these are the original mainsprings):
Time: 3/4 inch wide by 0.0162 inch thick
Strike: 3/4 inch wide by 0.0165 inch thick