Made in: Germany
A German Naval 4-rotor Enigma enciphering machine (M4), for U-Boat use, circa 1942-44. An operational M4 Enigma machine, for use exclusively on the U-Boat fleet, serial number No. M 17158, as stamped on the bed-plate, and aluminium rotors I, IV and VII, and a bakerlite Beta rotor and reflector, all with matching numbers M17158, lamp-board display, standard QWERTY keyboard of 26 keys, white on black, battery switch, ebonite steckerbrett (plugboard), with 4 cables, the outer case lid with 4 spare cables, a colored glare screen, printed instructions in German, and a set of spare bulbs. The keyboard and rotors set in a black crackle finish metal case, the machine in an oak outer case with metal lock and carrying handle.