Bulova 1940 -Unknown
Curved case measures 37mm lug to lug x 20.5mm non inclusive of the crown.
17J 7AP Movement indicates a replacement movement for the traditional 21j President. Black & Grey Dial, Gold hands, Grey Sub-Second hand, 10K RGP, Stainless Back
Thanks to Fifth Avenue Restorations for case identification & Old Ticker for the additional information.