Question regarding Silicon Graphics keyboard switch

[gmcenroe]

I have a Silicon Graphics keyboard from the late 1980s, early 1990s that is the grey granite bigfoot type of keyboard with the Silicon graphics logo on the top right hand side of the board. I removed a key to reveal the key switch. It is a green colored probably dome shaped cylinder under the keycap post. What kind of switch is this ,some kind of enhanced rubber dome? See the pictures.

[IBMPCDOS5]

Most likely a rubber dome/Dome with Slider. Do you have to bottom-out to accutate?

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[Tactile]

It's probably one of these.

[Daniel Beardsmore]

Looks like fairly bog standard rubber dome to me. It doesn't look like NMB to me, except for that green dome: NMB tended to use brightly-coloured domes. I never did figure out what the different dome colours meant, if anything. Colours I've seen so far are: dark green, green, yellow, dark grey and grey-green.

http://telcontar.net/KBK/Keycombo/brand.php?id=54

[klennkellon]

It's a regular rubber dome, just has a weirdly colored dome.