Union Army Cipher

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Made in the U.S.A. Precision laser engraved wood 4 1/4 inches diameter Product Description Learn More This famous cipher was used for message encryption by the Union Army during th e American Civil War (1861-1865). It was primarily a system used for flag signals where there was a line of sight, or for encrypted morse code messages. The letters A.J.M. on the disk are for the inventor and Chief Signal Officer of the Union Army, Albert J Myer. His system was called Flag Telegraphy or "Wigwag". Each disk has a unique serial number as was used in the original wheels. Featuring National Archives branding on the back, the packaging includes instructions. Show more