Gents,
Hate to be a pain in the ass, but strictly and precisely speaking, S/42 is NOT a proof mark. It is the code assigned Mauser by the Herreswaffenamt for marking their production. Thus it is much more analogous to a brand or trade mark vice a proof.
I have owned several guns that were W.W.I vintage and matching but had the S/42 barrel. Occasionally you will find them coded 42, but these are far less common. Magazines coded 42 seem to turn up fairly frequently, but I don't recall running across any coded S/42. go figure.
Tom A.
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