I also have a 1918 DWM Luger with the same example all numbers match inside and out but there are no stampings on the right side as you discribed above . I did notice that when I remove the slide under the barrell it has a few markings that look like an N with a circle around it to the left of the N looks like a (z) and to the right a (1 ) and above the N right top is what looks like a J also.On the frame inside the gun where the pin comes out to remove the cover plate there is a flat piece on the frame with some additional markings that also have the N circled with a 3 below right of the N top left is a 5 which is the last digit of the serial looks like a T R botton left of the N and top Right looks like a Vf where the V has to line like a F on the right side. Hope this did not confuse any body
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