I recently picked up what I believe to be a WWI German aircraft compass but it has a slight problem.....
Somewhere in its voyage through time, it lost either the compass card and associated markings, or the markings were cleaned off the compass card-I don't really know which for sure. It appears to be a later model Bamberg compass with lighting provisions through the bottom, but the bezel markings do not conform to other Bamberg pictures I have seen. The bezel is 11.5 Cm in diameter and is turned from aluminum stock. The body and bottom appear to be made from brass. The internal magnet and pivot assembly appear to be made from zinc. The Cardan mount is comparable to others I have seen except for the two large thumb screws on the outer gimbal which are clearly for electrical connections.
The key difference from the Bamberg (8 screw) bezels I have seen is that the number markings correspond to every 10 degrees instead of every 15 degrees.
Other than the number markings on the bezel, the only other external characters are the letters "Alk." below the liquid fill port which I believe stands for alcohol.
I would like to restore this compass to its original configuration if possible. I think the copper disc visible through the window is the actual compass card less markings. Can anyone help nail down what type of compass we have and what the compass card looked like?
Should there be any interest, I have pictures of the internal arrangement, and would be pleased to post those pictures as well.