I may be way off the mark but I believe I have a 1934 Hancock variant or a 1935 Hancock bezel with a 1934 movement. The strap also looks original with the writing "CALFSKIN" and "EXTRALONG" on either strap. Any further information is appreciated.
Hi Brendan, welcome to myBulova. Neat watch for sure.
S/N starting with a "9" with the absense of a case stamped 2 digit date code would indicate it is either a 1929 or 1939 case. Look for a date code on the movement. On the home page is a link to "Date Codes" that has a matrix of what they look like. We need to start by figuring out the date.
In reply to Hi Brendan, welcome to by neetstuf-4-u
There is a circle stamped on the movement so with the 15 jewels I thought maybe 1934.
your watch looks like mine Commander
the production number of the case is only six digits, the first digit could be missing and this would indicate the disproportion of the marking of the movement and the case
In reply to your watch looks like mine by jabs
Hi Jabs, the serial numbers that are there are stamped nice and deep and are very legible. I wonder how likely that the first digit would be missing?
Good point on the case S/N, Jabs. Is casing yellow or white gold plate? It looks white; and Commander ads of this time period only appear to list yellow as a choice. Face is also different.
In reply to Good point on the case S/N, by neetstuf-4-u
look to NOVA post in this thread, only Commander has engraving case
In reply to Good point on the case S/N, by neetstuf-4-u
It is yellow and white gold. Yellow where the engraving is and white on the sides.
Two-tone case is a match for the Cavalier which as also 15J. Dial is obviously different but could be a variant or a movement/dial swap from a Hancock.
Still could be another model.....
Ad dates to 1934.

Good ad find, Stephen. I think we are on the right track now. Dial on subject watch also appears to be a match to the Kirkwood shown in same ad.
Based on this advert I would agree that the case is Cavalier, noting a possible dial swap. This would be a first for the dB.