Possible: Bulova Midnight Clipper from 1965. Case (10KT yellow gold) and movement both dated M5. Movement is a selfwinding 11ALAC. Black dial with gold markers and luminous hands. Replacement leather strap. Case approx 30mm wide w/o crown.
Reference ads from 1964: ad-1 ad-2
One difference I see between late 50s models and this year's model is the number 6; earlier ones looked more like a G
Hard to photo without the glare off the crystal
-watch has a new owner 5/2014