Fra https://www.bonhams.com/auctions/23259/lot/1090/
ENIGMA UHR BOX.
Enigma "Uhr", Berlin, Konski & Kruger, 1944. 20 numbered patch cables and wooden rotary switch, as well as two metal brackets on left-hand side to allow attachment to the Enigma machine.
EXTREMELY RARE ENIGMA MACHINE ACCESSORY. The Enigma Uhr ("clock") was introduced in July 1944 by the Luftwaffe in order to add an extra layer of security to Enigma-encoded communications. Mounted beside the Engima machine, the Uhr was capable of changing the configuration of the plugboard circuits every hour by turning the wooden rotary knob. Despite managing to keep its development secret from the Allies, the Uhr's code was broken after just a few days by Bletchley Park.
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