Bulova Date Codes
From 1924 until the end of 1940’s Bulova used a series of symbols and letters marked on the movement to indicate the year of manufacture. Beginning in the 1950’s (with some examples from the late 40’s) a series of codes, with a letter/number combination, was marked on the case back to denote the year of manufacture. The letter indicates decade and number indicates year. The last few years of the 1940’s was a transitional period and both systems were in use. Examples of movments stamped with 47, 48 or 49 have been documented as well as watches with the code “A8” and “A9” stamped on case back.
Bulova case back date codes
A8 = 1948
A9 = 1949
Bulova Caliber Numbers
a.The number digit signifies the Ligne size of the movement.
b. The next two alpha digits (as below “AE”, “AA”, “CS”) have no real
meaning other than a reference ( like a name).
c. The third and fourth, and sometimes fifth alpha digit would signify the
functional characteristics of the movement.
Letter “C” means “center second hand”
Letter “A” means “automatic”
Letter “B” means “day and date display”
Letter “D” means “date only”
Movement number “10BSACB”
This would mean –
10 ligne size movement
Center second hand
If there are only two letters, then
the watch does not have the characteristics mentioned above.