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Circa 1943
Serial number A10588
4in. (10cm.) diameter

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Lot Essay

One of five rotors were supplied with every Enigma. Each rotor carried the serial number of the Enigma, but could have been used in a different machine. Rotors also carried a Roman number from I to V that indicated one of the 5 internal rotor wiring configurations. Any three of the five rotors numbered I to V could be put into the 3-rotor Enigma in an order determined by the code book instructions for the specific day of the month. This rotor carries the Roman number IV and the serial number 10588 indicates that the Enigma and the rotor were made in the middle years of the war.

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