Gun Sight, Gyro-Stabilized, MK 4E GGS
This is a Korean/Cold War era gyroscopically-stabilized MK 4E Gun Sight as used in aircraft of the Royal Air Force, primarily the de Havilland Vampire jet fighter. Made in 1950.
The glass is intact and the sun shade flips up and down. Range setting indicator rotates as does the armament selector knob.