I am very familiar with the Bulova cal. 10AN movement in its 15 and 17 jewel configurations, as I own and have serviced several Bulova models with this movement. But I recently purchased a Bulova in an Anchor step-sided gold-filled case with a 21 jewel cal. 10AN movement. The cap stones are friction fit, not screwed down, and the movement is marked "6 adjustments", which would lead me to believe this is an unusually high quality of finish for the cal. 10AN. Interestingly, the movement does not have a date code (unless it's on the dial side - I haven't yet dismantled it for cleaning and service, as it's running well as is). From the style of the case, I believe the watch dates from circa 1932-1935. Can anyone shed some light on this particular configuration of the cal. 10AN, e.g. what Bulova models it might have been used on, when and how long it was it in production, estimates of production quantities, or anything else that might be of interest. Thanks for your input!