Intresting. I suspect it's a bridge modified Unitas from late 20's. The crown wheel design reminds of Gallet/Electra work. You'd probably need to get at the dial side to see the caliber marking though.
It's a American Waltham Watch Co. Hunter case watch. Case style looks early 1900's. Waltham changed their name in 1907, so probably from before then. Most watches like this have a screw back; the serial number on the movment can give you a more precise date.
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