I'm curious about is the American Standard cases and their various hallmarks between c1919 to c1924. Can these case hallmarks help date the movements they contain? Some of our early watches (1921/23) have been "dated" using the first digit of case serial number. Some have not. With uncertainty of a firm date when movement signatures change from Bulova W. Co. to Bulova Watch Co. we now have a tentative range for this change-1921-1924ish. We don't use these Bulova signatures to date movements. Could early American Standard case hallmarks help narrow that range and address strength in correlation between first digit case serial number and production date?
There has been some previous discussion here, but not specific to early American Standard.
Retracing Bulova History http://www.mybulova.com/node/4960
But earlier... Below are a few of the c1919-c1924 American Standard Case examples in our database: Some have the "coat of arms" symbol as seen in the 1921 model 155 watch below. Note 14k case.
And yet another similar to above; entered as a 1925 unknown, also w/ "Monogram Quality", the "globe" and case serial number beginning with a 1.
...the 1922 Lady Maxim has the American Standard "Globe" and Case SN starts w/ (2).
....member syfre reports the "coat of arms" hallmark in the Am Std case for this 1924 model 154. case serial number starts with "1".
Some of my questions/thoughts:
1. What's the difference between the "globe" and the "coat of arms" symbols?
Is there overlap in the time periods we see these two symbols? If not, when did they change?
2. Can we say anything about movement dates based on the date change of symbols?
Could this strengthen the correlation between first digit of case SN and movement date method for this time period?
3. When did Bulova purchase American Standard Case Co?
Wouldn't Bulova immediately upon purchase stop using the American Standard marks and simply sign Bulova?
4. When did we stop seeing other brand watches housed in American Standard cases?
Did American Standard stop making cases for other watch brands before or after Bulova bought the company?