As best I can tell, with old eyes and a small picture, it appears to be the Eagle over "N" which is a Nazi commercial proof. In my Luger book it says this proof was ordered by Hitler, replacing the earlier Crown over N mark, and began use in April 1940.
To me, this dates the gun to either seized stock at FN when the Germans took FN (late May 40) or finished by FN under German occupation which ended in early Sept 44.
This Eagle/N proof is different from the WaffenAmt proof.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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