Bamberg compass

[stuk af]

Not sure where to put my question regarding this compass.
Feel free to remove.
Could anyone tell me where this compass was used, please?

[Gerdan]

http://de.wikipedia.org/wiki/Carl_Bamberg

http://de.wikipedia.org/wiki/Askania_Werke

It seems to be a "Flugzeug - Kompass"

http://www.deutscheluftwaffe.de/inst...e/kompasse.htm


Gerdan

[stuk af]

Thank you!
Just found a date 1915 on the dial.
And this is how the bottom looks;