I've got an 845, serial no. MPC 03XX, Performance Ctr gun, stainless, full-sized .45acp frame, semi auto, 8 shot single stack, Briley bushing. Believe there were 2 runs of around 300-400 each for the domestic market.
See them for sale occasionally around $800 which is underpriced in my opinion. Has a small following, never seemed to catch on, perhaps the 945 stole it's thunder?
Mine's a tack driver, built like a tank. Will take any of the 8 shot .45 mags from mod 645, and subsequent 8 shot S&W's.
Found this photo of mine, apologize for poor photo quality.
Good Luck, Kevin