I believe your single inspection mark is the sign of a receiver destined as a spare, or not assembled until after WWI.
Had it been used by the German services, it would have additional inspection and a proof marking on the right of the receiver in addition to that single mark.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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