Bulova 1940 Military Non-Issue
Case looks to be plated brass, no markings on case back or dial other than 'Bulova'. Strongly resembles some of the military models aleady in the database, but has quite a different dial, and no caseback markings suggesting it's not an issued model.
Watch runs, and keeps good time. Movement does not hack.
The caseback doesn't seem to want to come off, despite my best attempts. if removal is necessary for identification then I shall persevere further.
edit: I've had to guess the manufacture year, as I can't save the watch without one. I have no idea whether my guess is anywhere near true though.