It's an Electa caliber, which was also used for Eaton's branded pocket watches like Charon's in the late 20's. Charon's has the "Eatons" regulator, while yours has a normal one. I've seen other examples of these apparently supplied to the WW1 Canadian forces (which, at the time, were part of the British military). However, those watches should have the British broad arrow on the case.
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