Info on movement:
AF RS
15 Jewels
BULOVA W. Co.
3 ADJ
A.A.I.
33213
Swiss, and possibly the number 51
Info on inside case:
American Standard
25 years
14k Gold Filled
1091400
Monogram Quality
In reply to Note the case engraving ||||… by mybulova_admin
In the 1920s Bulova had a practice of hand marking the case back with the last 3 digits of the case serial number. To make this task easier they used roman numeral, using an upside down V to indicate '0', as it was tricky to hand etch a circle. So in your case the last three digits of the case serial number are 400 or as you can see the hand engraved IIII /\ /\
When Bulova produced a case they needed to separate the back part from the middle or bezel block and in order to make sure the pieces fitted together properly later on and not get mixed up with other cases, they would quickly mark the back and/or bezel piece so they they could all be married together at final assemble to avoid the different case parts getting swapped and as such not fitting correctly.
This process made sure all the case parts belonged to one-another when assembled.
In reply to In the 1920s Bulova had a… by mybulova_admin
Thanks to everyone who has replied so far. This is fascinating. This was in my uncle's watch collection and I'm really enjoying learning about it. The insight provided so far allowed me to do some further online research. According to the theoretical timeline on this site (http://m.watchophilia.com/general-information/determining-the-date-of-a…), this watch would be a 1921 model. What makes you think 1922 or 1923 instead? Thanks!
Thanks for the comment. I've done another search of case/move,ent serial numbers and would now tend to agree that the watch might be 1921.
31279 - 1087567 - 1921 - Lady Maxim - AAI
33213 - 1091400 - 1923 - Subject Watch - AAI
33372 - 1069107 - 1921 - Lady Maxim - AAI
Updating accordingly to 1921.