This popular 400 day clock from the 1950s has an oval base and dome. It uses the Kundo miniature 400 day clock movement with a 0.0023 inch thick Horolovar suspension spring. It has a pendulum locking device at the bottom rear of the movement.
Here is a video:
Repair job 5144. I cleaned the movement and polished one rough pivot. The suspension spring was good.
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