New owner

I am hoping someone can help me. I recently bought my first luger, a DWM 1920 commercial (?) on an auction that I am trying to find out about. SN is 69xx, all matching, it has "n" proofmarks with a crown above it, and "m" on the frame and barrel as well. The stock lug looks like it was ground down however. Was this normal and can you tell me what I should have paid for the pistol. Condition of the bore is excellent and bluing/strawing is about 85%.


Thanks in advance...Bobby