HEIMSOETH & RINKE; NOVEMBER, 1941

A FOUR-ROTOR ENIGMA CIPHER MACHINE
Heimsoeth & Rinke; November, 1941
Serial number M4117, with complete electrical wiring, three aluminum rotors( IV, V & VII), Gamma rotor and B reflector all with matching serial numbers, raised 'QWERTZ' keyboard with crackle black painted metal case, plugboard in the front with eight patch leads, four spare patch leads to lid which is fitted with spare bulbs and a previously unknown, probably unique, metal security screen, housed in wooden carrying case -- with a German Navy telegraph key and a facsimile user manual.
13½ x 11 x 6in. (34.5 x 28 x 16cm.)

Literature
www.cryptomuseum.com/crypto/enigma/m4/index.htm