movement date symbol means this is either 1925 or 1934 I've gone for the latter but it's a guess, case serial number begins with a 9 so don't know if it's a replacement movement. I don't like adding a pic ang saying please work it out for me but I'm lost with watches of this age so I'm leaving it to you guys sorry. Please note magic hour hand is BST ;)
Dear Pastyduchy, your watch is "Unknown". The shape is very close, if not identical to the Ambassador but that watch is plain without the golden sides as your watch. Bulova had more variants of this shape with different engravings etc. See the Brunswick. The model is from 1929 as per the serial number starting with 910. On Watchophilia and also in our database is one with case serial numbers very close to your watch. The movement is a replacement from 1925. But looking at the two examples I referred to, the 10AN seems at least to be the correct type number for this watch. A very nice watch. Congrats!
In reply to Dear Pastyduchy, your watch by Alex
Alex the movement presented in the watch is from 1936 (square) as its stamped USA and has the newer AR markings on the balance regulator. So I'm thinking a 1929 case with a 1936 movement replacement.
This is one of those 'Unknowns' that keeps popping up and it would be great to one find an advert showing this model one day.
In reply to Alex the movement presented by mybulova_admin
Depending on the mods done to the movt, they were found in both Swiss and US marked versions the year production was halted. Prior to that I have only seen Swiss marked movts. Based on an FHF 324 ebauche with up to 21 jewels. The US currently has higher standards for 'US made' than the Swiss do for 'Swiss made'.