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Hagelin C-35
Pin-and-lug cipher machine - wanted item

The C-35 is the first fully mechanical pin-and-lug machine developed by Boris Hagelin in Sweden. It is much smaller than any of the later machines of the same class and has five coding wheels. Furthermore, the lugs on the metal bars of the cage are fixed and can not be moved.
 
The C-35 was initially developed for the French Army, who wanted the machine to fit the pocket of their trousers. So they gave Boris Hagelin a piece of wood that would just fit inside the pocket of an army uniform.

On 8 November 2008, when we attended the presentation of the book Mythos Enigma by Dominik Landwehr in Basel (Switzerland), Hagelin's first employee Oskar Stürzinger presented some machines from the private collection of Crypto AG. The images of the C-35 shown on this page were taken that day.
  

The C-35 has five pin-wheels, each with a different number of steps and user-configurable pins. The number of pins on each wheel are 17, 19, 21, 23 and 25, which are all relative primes of 26. This gives a maximum cipher period of 3,900,225. The machine was generally painted blue and approx. 5000 units were sold to the French Army in 1935 [2]. The C-35 was succeeded in 1936 by the improved, but larger, C-36 that eventually evolved into the C-362 and finally the C-38.
 

 
References
  1. US Patent 2089603

  2. Wikipedia, C-36 (cipher machine)

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Crypto Museum. Last changed: Friday, 30 January 2015 - 17:14 CET.
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