It's police. The mark represents the Schutzpolizei (municipal police), Köln (Cologne) Administrative District. The "I" probably means the city of Köln and 59 is the weapon number. I'm stumped by the "N." Could you tell us the serial number on this gun?
Red "9's" were manufactured in their own serial number range (1 to 150,000) between the years 1916 and 1918. It is not known if the original contract was completed, however, based on your no. it could have been made in early 1918. When it was modified for Police use I don't know. Hope this helps.
A fair price would be what ever you could steal it for!! ) Actually the 1920 commercial reworks are worth a little less than the wartime Red 9's. If your pictures are true to color, it looks like the blueing is in the 95% catagory. A 1920 Commercial rework should be in the $750. - $1000. range. Others on this forum would disagree with me, but I collect Broomhandles and would never pay more than what I stated for that rework. Also, you have to take into account that I live on the East coast and for some reason, prices here are sometimes considerably less than on the west coast.
I finally got a chance to query my database of Weimar police unit marks and found several Schutzpolizie Köln C96s with M, N or S in the same location as yours. This is a WAG but I suspect these stood for Mitte, Nord and Süd (Center, North and South) and were precincts in Köln.
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