The "42" is the year that the receiver was made. Likely a Mauser receiver.
The other mark looks like a firing proof after the Luger was rebarrelled.
Your Luger is made up from parts from several Lugers. The "S/42" link was donated from a much earlier Luger.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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