This four rotor M4 Enigma machine was developed by the German navy in 1942 and its codes were not cracked by Bletchley codebreakers until late 1943.
Photo credit: Bletchley Park
Photos: Secret-code machines come to Bletchley
Protecting comms from WWII to the Korean War: Something of an Enigma
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1. Zakala
It's a shame the British Government aren't still using the "Super Enigma". I don't recall one of these ever being left on a train!