Proof marking.
Commercial Lugers usually have a Crown-over-N proof, sometimes Crown/U (Mauser Oberndorf); early guns may have Crown/B Crown/U Crown/G proofs, or no proofs.
Military Lugers have a much more complicated set of acceptance and proofing stamps, involving various combinations of Crowns-over-letters, stylized eagles over letters or numbers, stylized eagles over swastikas, Crown-over-M, to name just a few.
Commercial proofs are -usually- found on the left side of the receivers, left side of the breechblock, and under the barrel. Military proofs are -usually- found on the right side of the receiver, right side of the barrel, and left side of the breechblock. There are many variations on both of these placement styles, particularly on military guns.
--Dwight
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