Heading Selector, Zero Reader C-46 It is in exceptional condition

It is in exceptional condition given its age and appears to be new old stock

Since the factory seals are intact over screw heads

See photo of the location of the instruments on the Flight Engineers lower instrument panel from the C-121 flight manual dated 1958

such as heavy bombers B-17 and B-24

and the Sperry part number is 673447

Heading Selector, Zero Reader C-46 It is in exceptional conditionThe Zero Reader Heading Selector, made by Sperry part number 672670 2, was a component of the Zero Reader Flight Computer. The Zero Reader was used in a number of Cold War era aircraft of the US Air Force, such as the F 89 Scorpion and F 94 Starfire jet fighters interceptors (see photos from F 89 flight manual showing the location of this instrument). According to the F 94 Starfire Flight Manual: The Zero Reader is an automatic flight instrument that