You will have to contact Beretta.
83 or so
@ 1985
Early to mid-80s
Mid 80s
Feb.1984 with the serial number that you have provided.
No such serail number ever used for a 686. 50-450 USD
@1984
Mid 80s
c.1982
1983 or so
Mid 80s or so
r By calling S&W with the serial number.