Autopilot Selector Switch Panel Type N-1, USAF E-4 System,, C-130, 658421 Cold War This example has "US AIR

This example has "US AIR FORCE" embossed on its face above center

The precursor AN/APN-1 Radio Altimeter was used in a number of aircraft of the US Navy where close monitoring of height over terrain was critical

The serial number prefix is AF-55

as well as confirmation of the part number below the illustration

BT-13 Valiant

Autopilot Selector Switch Panel Type N-1, USAF E-4 System,, C-130, 658421 Cold War This example has "US AIRThis is an example of an Autopilot Selector Switch Module, Type N 1, for the USAF Autopilot Type E 4 (aka as the Sperry A 12 Gyrosyn Automatic Pilot System). The E 4 System was used in the late 1940 1950's and was still in use in some 1960's aircraft. Lockheed C 130 Hercules transports used this system, as well as civilian aircraft such as DC 3 and DC 6. It has a date stamp of October 1954. The panel is experienced but a fine artifact. The knobs turn.