Trgger lever stamp...
Mike,
Here is an update information on the unusual stamp on trigger lever... an old friend, Pete Ebbink provided this information via email last night. Pete is also a well known collector of Swiss Lugers, and a former frequent contributor to the Lugerforum. 
Quote:
Hi John,
Hope you are well.
In regards to the “ CN+ “ marking on the Luger under discussion over on the Luger Forum. A friend alerted me to the discussion and sent me a cut & paste of the question…
It means the alloy used to make the lever in the trigger side plate was made of chromium/nickel alloy and was inspected/accepted by the Swiss.
It is believed the part was made by subcontractors for the Swiss folks at Bern…probably by the firm of SIG.
However, this lever/marking did not really appear until the M1929 Lugers made by the folks at Bern and those were issued from 1933-1947/48.
So for this lever (with its marking) to be seen on a Luger made by Mauser in the 1930-1940’s, one can only conclude the original lever made by Mauser needed to be replaced and the civilian owner of the Mauser-made Luger got a replacement part from the M1929 Bern Luger variation.
Kind Regards,
Pete…
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If you are watching... Thanks Pete! 
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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