Flap Position Indicator B-24 Liberator, PB4Y Privateer, WWII GE DJ11 Oscar Fighter which measures 8 inches wide

which measures 8 inches wide by 18 inches long by 11 high

The center knob is to set the desired course and to cage the gyro

This 48-page booklet

The knob at the bottom is used to adjust variation

Appears to be New Old Stock

Flap Position Indicator B-24 Liberator, PB4Y Privateer, WWII GE DJ11 Oscar Fighter which measures 8 inches wideThis is a Flap Position Indicator as used in the WWII era Consolidated US Army Air Force B 24 Liberator Heavy Bomber (see 2 cockpit photos and photo from the B 24 Pilots Manual dated 1944) and the US Navy's PB4Y4 Privateer Patrol Bomber (see photo from Flight Manual dated 1945). Made by General Electric, Type DJ11. The indicator provided visual information on the angle of extension of the wing flaps during take off and landing, measured from full up