One final thought about the barrel/receiver. After a bit of research, it seems more likely that these both were originally from a 1917 Erfurt P08. Unlike DWM, Erfurt manufactured both P08s and LP08s with the notch on the front of the receiver, so the notch on this one does not necessarily mean this receiver was originally from an LP08. Also, acceptance stamps on the right side of the receiver appear to be crown over F, X, P. Even if this is not correct, they certainly are not crown over T, S, S as found on 1917 and 1918 DWMs (
http://luger.gunboards.com/showthrea...EPTANCE-STAMPS). This scenario seems much more likely than postulating that an Erfurt barrel was mated to a DWM receiver in the early 1920s.
Whoever replaced the barrel and receiver of this pistol apparently took this assembly from a heavily buffed and refinished 1917 Erfurt P08 that had seen police service.
I think we have wrung all the history out of this pistol that we are going to!