The enigma machine, vintage military messaging keychain

photo of an enigma machine, as used in WWII for coding military messages. The machine used a system of interchangeable wheels and other settings making it an incredibly complex coding machine to deal with. Allied intelligence eventually cracked the coding system , contributing to ending the war. A fascinating device for those interested in history, vintage electronics and mechanical devices, coding, cyphers, cryptography, messaging, security, or the military and war.