3461

Submarine Signal & Intl. Code Machine Stocks, 10 Total [191193]

Currency:USD Category:Coins & Paper Money / Stock & Bond - Certificates Start Price:10.00 USD Estimated At:110.00 - 150.00 USD
Submarine Signal & Intl. Code Machine Stocks, 10 Total [191193]
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All issued. 2x brown 1915-45 and 1919-44 Submarine Signal Co and 5x 1928 International Code Machine, an Ed Hebern company. "Edward Hebern of California designed this machine to encipher and decipher typed messages. It uses one of the most important developments in cipher machines, the rotor. Rotary cipher machines were introduced in the 1920s and 1930s for commercial purposes by several people in several countries. The rotors were wired so that electrical impulses were transferred from one element of the rotor to another. Rotating the rotors changes the flow of current, and hence the letters of the encrypted message. Typing a message into the machine, the user read out the encrypted message from the light board above the keyboard. The recipient of a message had a similar machine for decryption. Rotary cipher machines were widely used in World War II." from si.edu
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Provenance: Ken Prag Collection