12B is the Junghans 689/J89 movement, made especially for Bulova. (1951-1958) That might explain the 'Germany' on the dial, but I don't recall having ever seen that before...
Later Wrist alarms have the 11AERC, and 11AURCD.
Just a thought- Given the lack of Bulova markings on the case back also, ( I do see the small Bulova name next to the back) maybe the chapter ring is separate from the dial? That is, maybe the Bulova dial and movt are in a larger case, and the outer silver chapter ring takes up the space? Which would point to a re-cased watch. This would also necessitate a longer stem and pushers, but not impossible. We're gonna have to see the inside of this one, if possible. I suspect it is an early Wrist Alarm.
UPDATE: There is an identical watch right now (you-know-where) with exactly the same layout, same case back, everything, and pics of the 12B movt, so this appears to be all correct.
