WWI US Army Signal Corps Airplane Radio Telegraph Transmitting Set Box BC-15A. This is the BC-15A also called the SCR-65 radio spark transmitter. This was the very first radio transmitter ever used in an aircraft.
Outer wood box has some light scuffs but almost all of the original paint is intact.
UNTESTED. Nice piece of early military aviation history! Box Measures 6 1/2 x 7 1/2 X 3 1/2