PHAISTOS DISK (Minoan clay disk from 17th century BC; not yet deciphered)

ONE-TIME PAD (small enough to fit in the palm of a hand)

 

US ARMY CIPHER DEVICE (Consists of 25 aluminum disks; introduced in 192 and used till 194)

HAGELIN MACHINE (Invented by Hagelin and made in Stockholm in 1936)

ENIGMA MACHINE (Rotor cipher ENIGMA machine, inveneted by Scherbius in 191; this 194 version was for the Kriegsmarine)

ENIGMA ROTORS (With 26 electrical connections between the contacts)

A Windows-based emulator of the 3 rotor service machine.
Enigma Applet
Electronic Cipher Machine (ECM) Mark II