I'll just let my imagination go wild and assume it was used in some Soviet military installation for launch ICBMs
Those orange keycaps are just awesome.
DSC07309The switches are some sort of custom magnetic reed switches. Probably the only notable part about them is the weighting.
Around 1.5 mm it seems like there's a bit of dirt/dust in the exposed slider mechanism (it's not apparent in all the presses).

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DSC07262Yep, this reed switch is broken. Had to be careful not to cut myself...
And for those that are wondering, yes, it not longer functions correctly.
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DSC07264The only real markings.
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DSC07254Flickr Album: https://flic.kr/s/aHskGLThE4