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Hagelin C-37
Pin-and-lug cipher machine - wanted item

The C-37 is an extremely rare mechanical pin-and-lug machine developed by Swedish inventor Boris Hagelin around 1937. Like its precedessors the C-35 and the C-36, it has five cipher wheels, whilst the lugs on the metal bars of the cage are fixed and cannot be moved.

The image on the right shows a very rare example of the C-37. The machine shown here is from the private collection of GCHQ in the UK and was shown at the Enigma Reunion at Bletchley Park in 2009. The images have been kindly supplied by the GCHQ Historian.

The machine shown here has French text on its cover and was made for the French market (probably the French Navy) by L.M. Ericsson (the telephone company) in Colombes, just north of Paris, under licence of the Hagelin Company. The same company earlier produced the B-21.
Hagelin C-37 front view

The B-21 was produced for Ericsson's South American subsidaries. The C-37 was not only used by the French Navy, but also for French-British liaisons. At present, no further information about the Hagelin C-37 is available. If you know more about this device, please let us know.

Hagelin C-37 front view Hagelin C-37 interior
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Hagelin C-37 front view
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Hagelin C-37 interior

  1. GCHQ, Photographs of Hagelin C-37 shown on this page
    November 2012. Crown Copyright. 1
  1. Reproduced here by kind permission of director GCHQ.

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Crypto Museum. Created: Monday 05 November 2012. Last changed: Saturday, 24 February 2018 - 07:15 CET.
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