Nothing on outside case back except "OPEN" Inside case back: Bulova Quality Pat. Jan. 11 1927 1127945 - Single hinge case w/ dust cover intact. Movement 21 Jewel 6 adjustments Bulova Watch Co. Dial stamped Swiss - Bracelet: Hallmarked "Sternite" - Case Deminsions: 26.7mm (not counting crown) by 36.4mm lug tip to tip. Crystal: 15.6mm by 21.4mm measured in case at bezel/crystal edge. First digit of case serial number used to determine production date.
Edited 2012.08.26
The dial's different too. Notice the numbers down each side line up in the ad. The subject watch has the 1, 5 & 7, 11 inset. Close, but no ceegar.
As mentioned by fifth originally, this is the Bertram.
"Two-tone case" can mean black and white, as well as yellow and white!
Models are often found with both radium and dress styles.

Awesome watch do you still own this watch Will?
Did you ever sell this piece and for much if you did?
In reply to Did you ever sell this piece by Matthd
I have not sold it, and I don't think I'm going to. Its too nice. I need to turn off the "watch for sale" feature for this one.....although I don't wear it and have it locked away in a hermatically sealed freezer bag w/ a desicant pellet.... What's the point LOL If I don't even look at it, maybe I should sell it, but I'm not going to do so.....yet.
Well you should at least wear it and show it off, I bet it would start some great conversations. I'm a hobbyist who collects, repairs and ebay's vintage watches. But recently I've been servicing a collection for a client who lives in the United Kingdom and he sends me two 1920's era Bulova's a month for servicing and detailing, now I'm hooked on that era of watches. But like everyone else it's hard to locate parts , especially a good complete balance. I've been buying just about every 10AN I can off of eBay and its hit and miss for good balances, but I've got a great collection of parts!
I don't think this watch matches either ad graphic for Bertram. I'm changing from two ticks tentative on the current Bertram ID to one tick "not confirmed" (which means I think the ID is incorrect).