welcome to the forum
you have not provided enough information to help a lot. We can say it is a five digit commercial model that possibly was in army issue so receiving the 1920 gov't marking. as that marking is a govt marking, not a date
many more pictures and words would help.
See 'how to ID a luger' sticky here on the new collectors board.
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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