I repaired a Schatz standard 400 day clock made in August 1952. The next day, the hour hand did not align correctly with the minute hand. As I turned the minute hand forward, I saw that the hour hand was getting further and further behind. The hour hand was losing 1/4 hour every 12 hours, or one hour every 2 days!
I removed the hands and dial, and counted the number of teeth in the motion work gears. The minute wheel had 49 teeth instead of 48! I remembered reading about this problem years ago in the Horolovar 400 Day Clock Repair Guide (question 15 in the question and answer section). This is the first 400 day clock I’ve had with this problem. It probably baffled its owners, as it would seem to lose 1 hour every 2 days! I’m surprised that this problem wasn’t fixed years ago. The current owner bought it at a flea market and it wasn’t working, so he couldn’t observe the hour hand problem.
To correct the problem, I replaced the minute wheel with one having 48 teeth.
Repair job 4999. Horolovar back plate no. 1281. Dated 8 52.
Number teeth in Schatz standard motion works gears:
Cannon pinion 16
Minute wheel 48 and 12
Hour wheel 38
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