Finnish/Eastern European Compass

#3
No, I get it now. Its a subtraction scale.

Point the arrow in the direction you are going then line up zero with the needle, and hey presto, your bearing in russki mils.
 
#7
The reason the markings outside the bezel are reversed is because it is a diving compass. It's an early version of a Suunto SK6compass which they still make today but with the housing being acrylic and the strap nylon.
 

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