I have a 1916/1920 Erfurt Luger that I know nothing about any help would be greatly appreciated. I have tried to post pics but can not get them to load. So I will try to explain the gun. It looks as if all the #'s match. The front of the grip has the following letters and #'s SP. BN. 828. 1749 1179 the 828 & 1749 are x'ed out. the front of the frame under the barrel is marked 7361 (which is x'ed out) then the right ser.# which is 8193 the a N under both. All other parts are marked with a 93. If it will help I can e-mail pics for a better explanation.