Calling this one a 1928 Rona.
The 6AF moment is 15 jewels, consistent with others in the database, It has a crescent moon date code. It runs and keeps time.
The case is Bulova New York, 14 K rolled white gold, with a 1924 patent date. Its apparently a 1928 serial number.
I did replace the dial on this. Its from another identical watch (apparent Rona) that didn't have a case back but the movement also had the crescent moon so it apparently was also a 1928. Its kind of funny because a quick search shows that we don't seem to have a 1928 in the database but I somehow found two. :)