The 1920 "date" was used as a property mark by the Post-WWI Reichswehr and police units. The guns so marked were almost all military pistols that had seen service with the military in WWI. They were refurbished and re-issued. When Germany began to rearm and build its armed forces, those Lugers in service continued in service through WWII by the German army and police, and after WWII by the East Germans.
Jim
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