My best guess is that it started out a a 30 cal. 29 DWM commercial with C/N proof on receiver, breechblock, and original barrel. It was later put into military service. Barrel changed to 9mm and military style serial number placement added to follow regulations. If the takedown lever and sideplate or original you will also find '61' stamped on the bottom edge of each part (hidden commercial style).
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Mike C.
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