1911 Erfurt Questions

[deerhunter71]

Hello, I am a new member. I have a few questions for the advanced collectors. Does anyone know where these early Erfurts were first issued? The Luger I am interested in has proofs on the right receiver of crown over C, S, R and then the eagle. Of course it is not unit marked on the grip. Is there any way to tell the history of this piece? Maybe what unit used it due to serialization? He is asking $1000 for it and it is all matching including the grips, proofed wooden base mag, and the grip screws are proofed(the hold open was added though). There were supposed to have been only 10,000 made. Surely this piece must be very uncommon if it is all matching and was used through the duration of WWI. I am assuming that this piece was a WWI bring back due to the lack of Weimar or Nazi proofs. Anyway, anything you can tell me will help. I am attaching photos. Thanks.