Aid, Training, Morse Code, US Navy
Genuine WWII US Navy Morse code training aid. Instruction Press Down... Make Back Bulge is written on the top edge.
On the back is the Morse code with alphabet and numbers. Bureau of Naval Personnel - Training Aids . USN Nev. Pers. 40.038 Patent Pending.
Made of cardboard.
65mm x 68mm x 2mm.