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Rather they bear one of the "American Standard" case signatures.
The case signature begins to include the Bulova name around 1924.
Below are examples of the two movement signatures seen in early Bulova watches, with the example on the right becoming the standard signature after April 1923.
Of further assistance in determining the date of these watches may be the movement caliber, if one is printed on the movement.
That is, any watch movement with the signature "Bulova W. Moreover, that change corresponds nicely with the introduction of movement date codes.
Those three date ranges are differentiated by the presence or absence of certain case and movement markings as well as the nature of any such markings, as explained below.
It is important to note that the conclusions conveyed below are based primarily on ladies' models, as we have very few examles of men's watches dating prior to 1925.
Another fact to consider is the still relatively small data set for this time period.
In general, for all time periods, it is important to understand that Bulova watches never provide an obvious date of manufacture anywhere on the watch.
Rather, the date must be "de-coded" using symbols, serial numbers, and two-character codes placed on various parts of the watch.