The three letter serial prefixes started showing up in 1980 and the conversion to them was completed in 1983.
The S&W book lists AEV to AFJ prefixes in November 1984 and AHA 0667 with a start date in January 1985.
That would put an AFM serial around December 1984.
It's just approximate however as it indicates when the prefix first appeared, and some guns with the prefix may have left the factory later.
Last edited by BB57; 12-08-2016 at 11:46 AM.
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