This dry compass was used by the Wehrmacht until 1945. I found three models, but maybe there are more. This one is quite heavy and made of brass. The ruler is 5 cm long. The lid is narrow at the front.
The maker, R. FUESS (Fabrik für wissenschaftliche und technische Präzisions-Messinstrumente) was a German company in Berlin/Steglitz, (scientific and technical precision measuring instruments).
A fluid version also exists. ( see Compassmuseum.com/Busch )
These three compasses featured 6400 mils divisions counterclockwise.
Contains Radium paint. (0.5 micro sievert/h)