Heading Selector, Zero Reader C-46 Since the factory seals are

Since the factory seals are intact over screw heads

such as heavy bombers B-17 and B-24

as used in aircraft of the US Army Air Force and US Navy with tail wheel landing gear

Aichi E13A Type Zero Reconnaissance Seaplane aka "Jake"

and EC-121 aircraft

Heading Selector, Zero Reader C-46 Since the factory seals areThe 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