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The (crown) U and (crown) W proofmarks were also used prior to 1939, which makes more sense on a known war loot gun. There was a date stamp used from 1922 til 1939 that I do not see, which would make the gun older, pre WW I or early post-WW I.
The DRGM mark is for a registered design which is not as protective (or as expensive to get) as a patent. Looks like it covers the cocking indicators, the way it wraps around the disk.
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