Budget Watch Collecting/Bulova Caravelle date codes
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Starting in 1949, Bulova used a simple date code for its watches. There will be a 2 character code. The first character will be a letter indicating the decade:
A=1940's L=50’s M=60's N=70's P=80's T=90's
Earlier Bulovas used a cycle of symbols to indicate date. References can be found here:
Vintage and Antique Bulova Watches