This watch strangely doesn't have a case or movement serial number. Case is made by Duro Watch Case Co. Movement is marked USA. Date code appears to be an omega (1940 I am guessing)
Thank you for posting your watch. The Duro Watch case was a replacement case as is the dial. During this period jewelers would have kits for sale including a new case, dial and hands for the major brands. You could bring in your old watch and it would be upgraded. I suspect this is the case in your watch and we call that Non-Conforming. I also believe the movement is probably from 1930 and was replaced in the late 40's after a well worn 20 years.
Agree with Jim.It may have been a watch that a jeweler created from parts to be able to sell 'a' watch.
The 10AE was a workhorse movement through the 1930s and Bulova made a great many of them, so spares and parts would have been plentiful once upon a time.
Non-confiming for this watch.
I suspect the dial is also aftermarket as we have nothing on record that looks remotely close to this style.