1914 DWM - East German rework, possible VOPO gun

[Grendel]

Just picked up my second Luger. It's been awhile as I bought my first about ten years ago (and posted here about it). I'd been looking for a good "shootable" Luger in 9mm for a long time, and finally got this one on Gunbroker for what I felt was a reasonable price.

Seller described it as a VOPO gun, and it came with the holster and magazines as shown. It's probably force matched, but at least it was re-stamped and not electro penciled. However, I don't think I see the VOPO "sunburst" stamp anywhere. I do believe it to be an East German rework, though.

It has "crown U" proofs on it, which I believe to be East German from what I've read....there's another symbol above each "crown U" which may be another crown, although it kind of resembles an eagle with a shield on its chest to me.

What I know:
Toggle is marked DWM (script)
Chamber date is 1914
Magazines coded 2/1001 I believe are East German, made by Haenel
Grips appear to be East German "bullseye" type plastic replacements

What I'd like to know:
Did this start its life as a military or commercial pistol?
What history is able to be traced from its markings (origin, possible military use, possible Russian capture, East German use, etc?)
Identification of the various stamps (somebody's probably gonna tell me "buy a book"....which one?)
What is the "round" stamp near the takedown lever?
Anything particularly interesting/unique about this Luger?

Hope these pictures help. I wish I'd taken other photos when I had this at a friend's house and we were looking at it under magnification, but if need be I can try to go back and get those kinds of pictures.

Thanks for any information you can give me.