Costanzo (page 255) reports some "m" prefix lugers as 1935 Mauser tool room training pistols. This is the first one that I've heard off with an Eurfort toggle assy and more than a 2 digit numeric serial. It's difficult to see from your photos, but it appears that a long frame/receiver M1906 Navy barrel may have been installed on this short threaded receiver using a spacer ring. I have also seen this procedure used on a few 6" barrelled Weimar commericals. TH
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