I just finished repairing this 400 day clock with a Herr standard movement. The back of the movement is labeled “Hall Craft Corp.” and “REX”.
Here are movies of the escapement and rear view of the clock in operation:
Here is a slide show of six views of the clock:
The movement needed six pivots polished. Back plate no. 1212. Suspension unit similar to no. 21. Suspension spring 0.0035 inch thick.
Job 4813
I just repaired a standard size 400 day clock by Herr (Horolovar back plate #1159). This clock seems to be a copy of the Schatz standard 400 day clock (movement model 49) but is not as well finished. This clock needed more pivot polishing than most 400 day clocks. Quite often a Schatz 49 will need 3 pivots polished (T2F, T3F and T4F) but this one needed 8 pivots polished (T2 – T5 front and back). Also the verge (pallet assembly) on this clock is not as well adjusted as on the Schatz. When the depth is set so that the drops are equal, the locking is not as deep as I would like. It has a one piece pallet assembly like the Schatz, so you can’t correct the lock by moving one pallet out. I made the best compromise adjustment and the clock runs well.
Another annoying thing with this clock was the process of installing a new suspension spring. A .004 inch thick spring was specified in the book. but it made the clock run slow. The next thinnest available spring is .0038, which is too thin. So I removed the blocks and fork from the spring two times to thin it. Finally after being thinned with 90 stokes of 600 grit abrasive paper, the clock could be regulated.
My Job 4496.
