A 1944 German four-rotor M4 Enigma machine is to cross the block at Bonhams London on October 27.

It's valued at £80,000-120,000 ($125,176-187,764).

The M4 Enigma machine was used by the German navy

Bonhams explains: "The Naval M4 Enigma machines were made in much smaller quantities than the 3 rotor Army examples and in addition, the majority of these were lost when either when the ships and boats were sunk in combat or scuttled by their crews at the end of the war."

The record for an Enigma is $269,000, set for another specimen from 1944.

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