Help dating Browning BL22 !

Ace254

Inactive
I just bought a BL22... Having trouble putting a date on it. The serial number is 7B53253. Numbers are on the bottom. It does have a patent number. Any help is greatly appreciated!! Can’t upload pictures, but would be happy to email or text if needed.
 
Called browning, they couldn’t tell me what year it was either. The guy said in the early 70s, they did last two digits of the year, followed by the letter B... But he was unsure on single digit such as mine.
 
Dufus, from all the research I’ve done, that’s what I come up with as well.. But, supposively they didn’t start making the BL22 until 1968.?!?. /:
 
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