Compass, Aircraft Navigation, Armée de l'Air, Vion Short Sunderland it would have the small

it would have the small air filter AN-5821-1 attached to its rear top port

2 pages per aircraft

as evidence by the fluid line across the face between 330 and 30 degrees (see photo)

All of the examples of these that we've seen appear to have been directly built onto the instrument panel (as opposed to being separate units such as landing gear indicators Army Type A-2

Compass, Aircraft Navigation, Armée de l'Air, Vion Short Sunderland it would have the smallThis is the body of a Navigational Compass as used in aircraft of France, likely pre WWII. Made by E. Vion. The compass body would be contained in a cradle, and affixed to a mounting bracket, which could be attached to either a vertical or horizontal surface of the aircraft. This compass is intended to be positioned and read at eye level. The liquid is no longer contained in the body. The compass card floats freely. We believe it may be the compass