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WWI US CODE DISK
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Information
aus CRYPTO MACHINE
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WWI - Code Disk
ww1_code_disk1.jpg
ww1_code_disk2.jpg
With instructions for use on the reverse side. (Photos courtesy E-bay)

This code disk was used in the field by the U.S. Army Signal Corps at the beginning of World War I. The disk enabled messages to be quickly encrypted with a simple substitution cipher by rotating the inner ring.