1920 non-comercial?

[Highlander]

Trying to figure out what I have here. 1920 marked receiver ring. 9mm caliber. All matching serial numbers. No Nazi proof marks. Other than three proof marks on the right side and caliber marking under the barrel, there are no other markings other than a stylized "N" and last two numbers of serial number.. DWM is sharp does not appear to be refinished. Were all Lugers used by the Germans uring WW-II Nazi marked?