Unknown Model-rsvp? Looks Military. Dial--seconds numbered.
Case front looks fine for a chrome-plated Watertite, movement/dial/hands fine too.
Can't make out the thumbnail pic of the opened case back in the db, and can't bring up a pic with any res that helps any.
Count me out.
Edit- scrub that, the OP claims in root record that the inner case back has 50 followed by a five-figure sn.
This conforms to some other Watertite cased watches in the db, including one of mine.
"1950 Watertite" is my call.
Here they are, including another couple of screw down case back models.
http://www.mybulova.com/watches/1946-seabee-7054
http://www.mybulova.com/watches/1950-watertite-7476
http://www.mybulova.com/watches/1951-watertite-5578
In reply to Nice work Bobbee, they by mybulova_admin