I have a 1930 ladies watch here in perfect condition with a white gold looking case. The back inside says Bulova Quality curved at top & Pat Jun 10 1924 curved to meet it at the bottom, like most do of this era.
In the middle of this, where there is usually a blank or '14k' 'or 'gold filled' and so on this case simply has 'AAA'.
I have never come across this before and have no idea what it means or what the case is made of. Anyone? (i'll get a photo soon, haven't had the time yet)