Hi:
Just purchased a 1917 Erfurt matching luger. In looking over the pictures the seller sent, I noticed a notch on the top of the receiver as might be found on artillery lugers. The barrel appear to match and is 4 inches. Were all Erfurts produced near the end of the war made with the artillery notch? If the barrel serial did not match, I would think this gun had been rebarreled, but that does not appear to be so.
Any insights? Thanks.