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They are linear switches, but definitely a little dirty. I'm hoping the keyboard is still functional, but the lab it was in partially flooded last year.
I actually had the top of the switch come off and try to escape in the one I took a picture of.
Vintage Keyboard I found in my lab that I'm trying to get cleaned up and see if it is still functional. Network Computing Devices model N-108lk. It uses Hi-Tek two eye "space invader" linear switches. I believe it is from sometime in the late 80s, but I'm not sure if there is anywhere I can check the serial number to find out for sure. Overall the switches still feel really nice.
edit: This uses a ps2 port so I don't need a converter. >

The distribution reminds me of the DEC terminal keyboards (some clones also used space invaders), nice it’s a PS/2 board.
Are those clicky space invaders? I hope they are not too dirty inside the mechanism. Clicky ones in good shape feel really nice.
My experience removing those keycard it’s a bit of an annoyance, the top of the switch comes out easily and the spring may fly away if not carefully.
Great find!