Christian,
Your friends may be referring to a small group of commercial Mauser Luger pistols that have S/42 on the toggle instead of a Banner.
These are found between #5216v and #5569v; having 1938 on the chamber and C/U proofs. Only 8 have been reported so far. There are also some Banner marked toggles reported in this range, but these have chamber date 1939.
I hope this helps.
__________________
Joop
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