DescriptionSpeed-X Practice Set Model 450 used by John F. Carney of Hoboken; Radioman, 1st Class, U.S.N., during his World War II service, Jan. 1, 1942 - Nov. 7, 1945. Item is known as a telegraph key set; code oscillator. Carney served on: U.S.S. New York U.S.S. Jeffers U.S.S. Neunzer It is unknown if this item was actually a navy issued item at one of the training schools he attended, but he did retain it with other items related to his military service. Metal, molded plastic (bakelite). Lacking the buzzer cover. Made by Speed-X (name is sometimes seen as SpeedX and Speed X), San Francisco.