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[Sergio Natali]

Originally Posted by alanint

That's a Swiss proof. I'm totally ignorant of these markings, so I have no idea what the additional "CN" is. We have members on the site who will expand on this.

As already stated "CN+" surely stands for the alloy composition and is a fairly common mark on Swiss W+F 06/29

However this appears to be a very interesting 1900/06 gun, made with pieces that I assume Mauser inherited from BKIW and maybe somehow sold to the Swiss between 1936/1939. But on this last thing I might be completely wrong, as Waffenfabrik of Bern had already started to produce their own firs Lugers between 1916 and 1917 and those pistols were delivered to the Swiss Army in November 1918.