USAAF type D-4 navigational computer
Dimensions:W: 11cm (4.3")H: 11cm (4.3")
By G Felsenthal & Sons. Circular, approx. 11cm diameter. Manufactured in black plastic with luminous markings. Fully AAF marked and in excellent unused condition with the original card sleeve of issue having a 1944 contract date. Used by fighter pilots, the small size enabled the pilot to carry it in his A-2 flying jacket pocket. Stock code M21885.