Thanks much for the information and link. Interesting topic.
I had looked through Kenyon's book, and he says these were refurbished Lugers in violation of the Treaty of Versailles. But in "The Luger Handbook" it said on page X only that they were assembled from parts smuggled by workers outside the factory. I need to dig through Datig's and Walter's books to see what they have to say too.
Also it sounds reasonable that a variety of markings - or lack therof - would have occurred during the changeover from DWM to Mauser around 1930/31.
I imagine all of the above has some truth. Makes for interesting debate.
I'd almost consider bidding on this piece, but I just bought something else so my funds are dry right now. Hint: Longer barrel!
- Dan