I've had this for many years now, serial number 631XX. It was accompanied by the uncommon "military" open sided magazine. The dust cover actually came into my possession with another (much earlier) gun, but it's this one that has the requisite grooves on the frame to mount it. I installed a steel backstrap, but of course retained the original alloy one, so the modification is readily and completely reversible. While I've never researched its history, I imagine this shipped in the mid to late 1960's.

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