No,
DWM did not "skip" numbering side plates. They had to be fitted to the frame and sear to function; it is one of the more important numbered parts for interchangeability.
Magazine- yes , any magazine should fit. As you surmise there must be something interfering.
Could be some rust or dried grease, or a burr or dent. You can likely see it when you have it in hand and get the grips off.
Do post pictures when you have it.
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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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