S&W model 64-1 made from 1972 to 1976 to be changed to the 64-2 in 1977. The B.R.P.D. is most likely a P.D. stamp but it's a wild guess as to who's. It's value is not really added to or subtracted from by being a police issue gun. Some collect the P.D.s and may pay more others will not own one on a bet. Most of the issue pistols are sound and good shooters but tend to be a bit holster worn and carry scared, for Myself I like them.