Hi, and welcome. In looking at the SCSW serial number table, AYM was made in January 1988 and BBF in July 1988. Assuming the factory didn't use a prefix out of order (as they did for the first 640s with the CEN prefix) I think you can reasonably infer your gun was made in the spring of 1998. This is late for the -2, and you may have a -3. Hope this is helpful.
My -1 purchased new 9/81 74K38XX
My -3 purchased new 8/86 AH208XX
Hope this helps.
Russ
I think you had a typo. Should be spring of 1988. But we know what you mean.
YER right. 2 typos. Fixed 'um above.
I had to get the piece out of the safe, with appropriate fondling. Original reciept from FFL dealer was incorrect/illegible. Andy's dead & gone so I guess it does not matter except to me. Thanks for bringing this to my attention so I could correct my records.
Russ