Hi Jordan,
Welcome to the forum. I beleive the 1921 stamp is a property mark, not a date. Most property marks were 1920. They were hand stamped. Dates were stamped using a roll die. The 5 digit S# is commercial. I beleive it was pulled from commercial production and diverted to the military. The Weimar acceptance, military style numbering, and the 1921 added at that time. Commercials have hidden #'s and a blank chamber, and of course no military proofs.
A very unusual Luger... Thanks for posting.
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Mike C.
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