The P-51 Mustang by Len Morgan, Famous Aircraft Series F-82 See images of the scope

See images of the scope on the F-94 and the F-89 (instrument panel from the F-89 flight manual)

but we recently sold another with US Navy label on its case and 1955 service label

Here is a WWII-era Aircraft Spotters Handbook published in 1943 by the National Aeronautics Council for use by civilian air observers

soldiers and officers of the Red Army

At both top and bottom of the compass housing are compartments for compass correction rods

The P-51 Mustang by Len Morgan, Famous Aircraft Series F-82 See images of the scopeThis 92 page book was published in 1979 as an overview of the P 51 Mustang Fighter. It contains both descriptive text of operating the aircraft as well as background on its development and deployment. It also contains a condensed version of the 1945 Pilot Training Manual.