You may recall discussion of the infamous Laser AT keyboard, which I thought had three backslashes.
I was wrong, it only has two, and despite having an L-shaped enter, has a long backspace. (I scored one from Goodwill today.)
Anyway, here's a pic of the keyswitch:

It has full keycap compatibility with Cherry MX, FWIW - I swapped some caps back and forth between my Scorpius M10 and it.
I did see a thread saying that they were SMK switches, but... I can't quickly find anything saying for sure that SMK made their own switches. Any proof?
Oh, and I also scored a Graymark F-21 board. Keycaps are double-shot molded, and it uses white Alps of some sort. Holy CRAP that's a loud board, and it's not even a good loud like the Model M. And I think I now know what people mean by "gritty" Alps.
I would pull a keycap to check what particular TYPE of Alps it has, but it's got an AT connection and no Windows keys, so it should be FAIRLY safe to assume it's real complicated (although there are other versions of this board with Windows keys, it seems...) And, I'd have to pull EVERY keycap *AND* remove 11 screws, to remove the top cover, as it's molded so as to only show the sliders themselves, not the whole keyswitch.