Help tp ID German Compass

[Vlaad]

I need to ID this german compass. I have no idea if it's from aircraft or boat. No doubt, it's from WWI relic.

[Vlaad]

I found something:
http://www.cockpitinstrumente.de/ins...talogMenue.htm
Enter: "Equipment type", then "Navigation equipment"- Compasses
Flugzeug-Rumpfkompass, Normung: "Armeekompass 3" ca. 1918

Wooden box seems to be added later. I'll take it out and look for mils.