My 64 from J&G doesn't have the nicest finish in the world, lots of small dings and scratches, mostly on the right side, from getting banged around in a holster. Mechanically its excellent, and it was very clean, barrel, chambers, etc. It appeared to have been cleaned quite thoroughly either before it was sold to J&G or by J&G. It also does not appear to have been fired very much.
My understanding is that these revolvers came from a security company trade-in. I've heard Brinks, but I can't be sure. Other than not having the matte stainless finish, mine looks exactly like a 64-5 NY-1.
I was looking for a shooter, not a nice looking collector gun, so I could care less about the finish, especially for the price. If I can scrape together the funds, I might just have to get another.
J&G has round butt versions for $20 more. These are later production guns, many of which had the magnum frame and frame mounted firing pin. However, the picture they have on the website shows several of the RB versions without the magnum frame and the firing pin where it belongs. If I decide to get another, I may go RB if they can guarantee me a pre-magnum frame version.
I would say that the huge majority of the PD trade-in revolvers are gone. However, there are an awful lot of corrections agencies still using revolvers. NC Dept. of Prisons & Probation and Parole just switched in 11/2007 from revolvers to .40S&W M&Ps. Prisons had primarily the 4" SB model 64, P&P had the 3" RB 65. I was hoping to see some of the 3" 65s for sale locally, but so far no luck there.