Here is what I have on it:
Manufactured by the Keystone Watch Co., owner of Philadelphia Watch Case Co. which purchased U.S. of Waltham in 1901. Part of a run of about 1000 produced serial numbers 779000-780000.
As usual Tom nailed it.
The first thing I'd try is to push the regulator to the center. Then check the timing. As was previously stated whether to repair it is purely personal.
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