The Microsoft Mouse 2.0 (1991) is at the Museum of Modern Art. It is often cited as an example of good design.
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Always liked that one.
I use one every day. I'll tell you: It's a good mouse. It works reliably and has just 2 simple buttons with no bells and whistles.
There's also a later model with a scrolling wheel, but that one is PS/2 only and has a slightly different construction and is not as comfortable as the Serial Mouse 2.0.