B-24D Armament Service and Instruction Manual, 1943 F6F Hellcat On the dial there is

On the dial there is text which reads "Scade Radium 15-9-43"

It has a service label from the US Air Force Tinker Air Base's OCAMA (Oklahoma City Air Materiel Area)

The center knob adjusts the indexing indicator for the view angle of the pilot

or paired with another in a four engine aircraft (such as a PB4Y Privateer)

so it was likely made for a Navy version of the C-121 (R7V-1) or another US Navy aircraft

B-24D Armament Service and Instruction Manual, 1943 F6F Hellcat On the dial there isThis is an original WWII era Armament Service and Instruction Manual for the Consolidated B 24D Liberator heavy bomber of the US Army Air Force, copyrighted in 1943. It is in exceptional condition. At almost 200 pages, the manual details instructions for operating and servicing the B 24D's Bombing Equipment, Defensive Armament, Turret Operation (4 chapters worth). and a ~50 page supplement on the 50 Cal machine gun. The manual is hard bound, and in