Sorry Ron, I was rephrasing so took my reply out, but you were too quick
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It sounds interesting. Besides the above, it sounds like a "sneak" (of which I hate the term, as it is not a snake), in the late 1920's (1929, perhaps into the early 1930's) DWM made lugers which did not receive any marking on the toggle or date; mainly for the police, but I am sure some army received them.
Also, if it was marked "commercially" it would only have a proof of crown N on the left? But then there should be one on the toggle too.
Perhaps an armorers put together or GI "PX" gun after the war?
Ed