Navigators Information File, WWII Sally Bomber Spare bulbs are contained in

Spare bulbs are contained in the two receptacles below the red and green lights (see photo showing the bulbs removed)

While flying at the selected limit

Here is a beautifully-presented chrome Letter Opener promotional item from the Standard Steel Propeller Company of Pittsburgh

or release it for use during flight

It is labeled as Property Air Forces US Army

Navigators Information File, WWII Sally Bomber Spare bulbs are contained inThis is an original WWII era Navigators Information File published in 1944 by the US Army Air Force. It is the basic reference book for aircraft navigators in the performance of their duties. See photos. The page numbers are by section, so total pages are not estimated here. It is about 1 2 inch thick. All pages are intact as is the soft cover. Its hard to find another in better condition than this example.