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This is a Rojon IBM Beam Spring keyboard from 1978. It is my third beam spring keyboard, I also have a 3278 terminal keyboard and an IBM Displaywriter keyboard as seen here: http://webwit.nl/input/ibm_beam_spring/ Rojon is possibly only the maker of the cable (thanks ch_123).
This one is new or almost new, and the rubber mat underneath the keycaps is completely intact. In fact it is so pristine, when I press a key, the keys next to it wobble! This is energy transfered by the rigid rubber mat. It feels and sounds a bit duller than the well used 3278, and has really wobbly caps.
The beam spring is the best switch for a computer keyboard ever made, and probably the most expensive one too. The beam spring is a direct offspring of the IBM Selectric typewriter switches. With the Model F, IBM tried to simulate the beam spring with a much cheaper and simpler design. It is good, but not as good as the beam spring. With the Model M, they tried to simulate the Model F. Same story.
It would be nice to make it work on a modern computer once. The beam spring has the same actuation force as the Cherry Blue (aprox. 50g), but it makes the Cherry Blue look ridiculously bad in comparison. Combines light touch with silky smooth yet very sharp tactile buckling point.