TACWM logo

Object Record

  • Email This Page
  • Send Feedback
Object Name CODING DISC
Catalog Number 0985.09.00068
Description The coding disc is a brass disc with "C.S.A. S.S." in red Gothic script in the center. The outer circle spins on a pivot pin and is marked with letters of the alphabet, which are used to match against the inner circle's similar marking. No inscriptions on reverse; three marks, that could be a crude Roman numberal "III" or a rough "M", are engraved near one edge on reverse.
Material Metal/Brass/Paint
Dimensions D-0.375 Dia-2.25 inches
Provenance The coding disc was used by the Confederate Secret Service to translate messages.
People unidentified Confederate soldier
Search Terms Secret Service Bureau
Special and Secret Bureau of the War Department
Confederate Secret Service
Subjects Ciphers
Cryptology
Encryption
Espionage
Secret service
Spies
Spying