Early 1920s Bulova watch dating
I'd like to officially put this forward to the myBulova.com community at large to scrutinize and see if it holds true. We've always had a problem dating the very early 1920s vintage Bulova wstches and often used the first number in the case serial number to date the year of production.
Well I'd like to suggest that for pre 1924 watches (pre movement date code) we use the second number to date the year of production.