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I have one of the 640's, a 1990 no-dash, laster-etched inside the frame, "Tested For +P+". I contacted S&W to ask about details of when and why they marked some guns that way, but they seemed not to want to talk about it--basically lawyered up and said they don't recommend using +P+, although I had stated and meant that I had no intention of doing so.
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My 640 was also a no dash, but not the +P+ marked one you have. From what I understand they were for the FBI as backup guns or off duty guns and are somewhat rare. Hold onto that one.