I ordered a 3” Model 64 from Centerfire Systems a week or so ago and mine came in this week. There were imported Police Trade Ins. The 3” are gone but they still have some 4” left at $399. Talking to a few others and seeing posts on other forums, what they sold was a mixture of dash 6 & 7’s. The -6 were pre lock and -7 had the dreaded lock. It was pot luck what you got. A few like mine came with a lanyard ring which is fitted into the grip not drilled into the frame. I understand some were really filthy but I lucked out. Mine was pre-lock and pretty clean. Trigger was heavier than most of my other Smiths but after I stripped it down, cleaned and oiled it and put in a 15lb rebound spring, all is well. I’m tickled to death to add another 3” to the collection for $400. If anyone knows what the proof marks mean, I would love to know.