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As said in my first comment above, as from case serial starting with 141xxxx, Bulova got their own case signature mentioning Bulova Quality. All cases with serial numbers after that e.g. 509 of the subject watch still having an American Standard case signature were supplied to other brands. Indeed, American Standard was owned by Bulova, Arde to be precise, not the company. He/American Standard sold cases to other brands from a separate sales office based 14 John Street and later from 11 Maiden Lane, while the Bulova Watch Co. office was in a different location.