Intel D80287 8
Being made in 1986 I figured this CPU would be a nice photo-object in combination with an old 5,25" floppy disk. It's 2MHz faster than the 6MHz model but technically it's identical.
The 287 is able to do floating point calculations (FPU) and can be installed next to a normal 286. Early 386 boards allow you to pair up a 386 with a 287. Modern 386 boards only have sockets for 387's.