This is a nice example of Microsoft’s first mouse. It is known as the green-eyed mouse for the color of the buttons. The buttons look sort of blue to me. But if you look this up in Microsoft’s website it looks the same color as this one.

This is untested. Please note this does not have the stickers in the bottom. There is some discoloration. I did not try to do much to clean it up because I wasn’t sure how best to do that.