RAF Bombsight Mk XIV Emergency Computor Ref 9/2648 F7U Cutlass This is an original WWII-era

This is an original WWII-era Radio Operator's Information File published in 1944 (updated 1945) by the US Army Air Force

evidence of a manufacturing year of 1942

are open scale marking

and the Boeing B-29 Superfortress

The serial # is 1538/58

RAF Bombsight Mk XIV Emergency Computor Ref 9/2648 F7U Cutlass This is an original WWII-eraThis is an authentic original WWII era Emergency Computor (sic) designed for use with the Mark XIV Bombsight in the British RAF's Avro Lancaster Bomber. It appears to be a manual back up device for use in an emergency, possibly if the mechanical computer within the bombsight malfunctioned. One side shows speed as measured in knots, while the computer on the other side shows speed as measure in MPH. This plastic or bakelite device has a circular slide