What I consider to be the most classic Logitech mouse is the C-7 Series mouse. I bought one used from a
coworker or my father's in 1987. About that same year,
they had a limited edition version of the same mouse which
featured a see through case and neon colored electronic components within. I still have my C-7 Series mouse, in a
box in my closet. It still works, doesn't have too much mousepad crud on its mechanisms, but I can't find a
version of Microsoft Windows or appropriate XFree86
settings for my Linux systems that can use it properly.