As Mark mentions, "S/42" is the military concealment code used for parts manufactured by Mauser.
It would seam that at some point this beautiful E/N proofed commercial police pistol found it's way to a military armorer for a barrel replacement. (See below for details from Tom and Jan... Factory original most likely...)
Unique and interesting!
Is there a mark of some type (perhaps a small "x") on the base of the frame shown below the magazine in your 5th photo?
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
Last edited by mrerick; 10-11-2012 at 04:04 PM.
Reason: Updates from Tom and Jan below.
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