The M is for "Marine" (Navy), the N is for "Nord" (North) and indicates issue to the North Sea Fleet. The weapon or rack number is 422. As it isn't a normal Navy Luger, it likely has an interesting story behind it. I'm guessing that it was used by the Weimar Republic Navy due to the "1920" property stamp.
There are individuals on this forum who are more knowledgeable than I about Navy Lugers.
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