Finnish/Eastern European Compass

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.
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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