ted
I believe the s-42 on the barrel is the proof mauser put on the barrel or other parts when they replaced them I think I read this in Kenyons lugers at random I could be wrong dont have my books with me. but I have a 1917 with s-42,eagle over za and w155 on the barrel what you might want to look at is right behind the barrel is there a notch there is on mine I suspect mine was a artillery model (8" barrel) that was reworked.
the notch was there for the different style sights.
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