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Instruments of Science & Technology / A US NAVY CSP-1756 CIPHER DEVICE, AMERICAN, LAST QUARTER OF THE 20TH CENTURY,

Lot 15
A US NAVY CSP-1756 CIPHER DEVICE,
AMERICAN, LAST QUARTER OF THE 20TH CENTURY,
28 September 2022, 14:00 BST
London, Knightsbridge

Sold for £1,530 inc. premium

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A US NAVY CSP-1756 CIPHER DEVICE, AMERICAN, LAST QUARTER OF THE 20TH CENTURY,

the reverse reading U.S. NAVY CSP-1756, with board with a fixed plastic strip at the top, another fixed plastic strip at the bottom, and three grooved channels in the centre, each containing a sliding strip. The plastic strip at the top is marked with an alphabet-numeral sequence consisting of a normal alphabet, a slant sign, and the numbers one through zero. The plastic strip at the bottom is marked with a numeral sequence consisting of a series of numbers from 00 to 36 in reverse order,
15in (38cm) long

Footnotes

Each of the three sliding strips is marked with a normal alphabet, a slant sign, the numbers one through zero, a vertical, black line, and the same sequence of characters repeated.

For operating instructions, see:

https://maritime.org/tech/csp1750inst.htm

Additional information