Here’s a Schatz 1000 day clock I repaired recently. The movement has a nice, long, well finished mainspring, wound up in a barrel, that will power the clock for nearly three years on a winding! The power decreases as the clock runs down, however, so the rate will vary. If you wind the clock yearly, it will keep much more steady time. The small gears and pivots, and deadbeat escapement help the movement run efficiently. In addition, the torsion (rotating) pendulum makes the clock tick only once every six seconds (instead of once per second or more for regular pendulum clocks), reducing the power consumption even more.
The back of the movement has date code 8 56 (August 1956).
I didn’t polish the base on this clock, because the patina was so nice. The silver finished brass dial is in amazing condition.
Repair job 8688. I polished the pivots. These 1000 day (and also 400 day clocks) rarely need bushings. Horolovar back plate no. 1010A. The suspension spring is 0.0024″ thick. This clock uses a #8 (American size) winding key. A large wing key works well. A Hermle chime clock key will fit, too.
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Yes, every now and then, they may need a bushing or two. For example, a pivot might be rusty and need to be filed down to remove the rust, then polished or burnished. Then, it may be too small for the hole, so I bush it.
Sometimes they do need bushings, though. Mr Terwilliger notwithstanding, these are old clocks–though my guess is that few of them have run for more than a few years because Daddy, deceased for some thirty years, tried to fix something and broke the suspension spring. That is a splendid 1000 day clock though. My tremor prevents me from successfully repairing them lately.