I built this 4" 9mm shooter from a much mis-treated Bulgarian frame and a 1912 Erfurt upper a while back.
I'd forgotten I had not taken pictures of it, so I did yesterday.
The lower is re-blued and mismatched with Vopo grips that I added for shooting; the upper is an all matching 1912 Erfurt assembly. Bore is fair/good, but the combination works just fine.
One of the features is the lack of the lanyard loop at the back of the upper frame and its relocation to the base of the grip, can't be seen here because the original base lanyard loop was removed, but there are two holes in the frame for it.
The other Bulgarian features are the lack of the stock lug, and the markings in Cyrillic, in this example the Bulgarian word for fire was milled away before re-bluing. Original Bulgarian lugers have the Bulgarian crest of a rampant lion on the middle toggle and the DWM scroll moved to the top of the chamber.