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M4 4-rotor Enigma machine valued at $218,500

The M4 4-rotor Enigma machine was captured from a German U-boat



A rare 1944 M4 4-rotor Enigma machine will auction at Bonhams London on May 18.

The lot is one of around 120 surviving Naval M4 machines - employed by the Germans for sending encrypted messages during the second world war. This example was captured from a U-boat.

Enigma 4 rotor
The 4-rotor M4 Enigma machines were mainly used by the German navy

These are particularly rare, as the majority were destroyed before the vessels could be boarded.

It's valued at around £100,000-150,000 ($145,605-218,408).

A new record for an Enigma machine was set at Bonhams last year for another 4-rotor specimen captured from a U-boat. It achieved $365,000.

The Enigma code was originally cracked by a team of Polish mathematicians in 1939. Alan Turing famously advanced the techniques, allowing the British to translate messages.

The breakthrough was only revealed in the 1970s.  

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Images: Bonhams

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Last updated: 26 April 2016