Aircraft Navigational Computer Type N B-66 The indicator is in exceptional

The indicator is in exceptional condition for its age

This Release Button was mounted on the top horizontal tubing of the pilot's yoke to quickly release the autopilot for manual flight control when seconds counted

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

Interestingly

The first flight of the AC-130A wasn't until 1966

Aircraft Navigational Computer Type N B-66 The indicator is in exceptionalThis is a WWII era Aircraft Navigational Computer Type N. The bottom of the metal case contains a mechanical computer to solve the wind problem. It has a locking mechanism and a movable arm for drift, adjusted for air speed, interconnected to the heading tracker. The lid contains a calculator for speed, time, and distance, and gals hr. The carton measures ~ 11. 5 in x 4. 5 in x 1 in. Its is in very good condition given its age.