Compass, Direction Indicator, Kollsman Type 488C-01-615 Poly-Plane Compensator ME-109 and also contains an anchoring

and also contains an anchoring hole for an HF wire antenna support

The center knob adjusts the indexing indicator for the view angle of the pilot

which is usually simple to do

This is a WWII-era Turn and Bank Indicator (Wendezeiger) FI 22412 used in various aircraft of the German Luftwaffe

fuselage tank (110 gals)

Compass, Direction Indicator, Kollsman Type 488C-01-615 Poly-Plane Compensator ME-109 and also contains an anchoringThis appears to be a 1930's era Compass and Directional Indicator, made by Kollsman. We've not seen one until this specimen was found, have failed to locate any documentation on it, and therefore can only share what we can physically examine. It is a large instrument, 5. 5 inches diameter by ~4. 25 inches tall and 4lbs in weight. It is comprised of a liquid filled compass, which indicates with the thin inner pointer, and a larger direction indicator