I have long had a fascination for oddball mice and keyboard examples. As oddballs go, this one is not really extreme. But it is so much of its time. What you are looking at is a very old three button Sun mouse that turned up in a box of bits today.
Most of our modern mice still provide some form of middle click, but it is nothing like the importance that was once placed on the function. That is a big middle mouse button. Not some awkwardly clickable scroll wheel that may or may not do anything.
I just tried mine on this computer, and the results are varied… So few things actually support middle-click these days. I suppose it is destined to be a relic as we move further along into our touch and gesture based future, but it is always fun to look back at where it all came from.
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