For your consideration, here is an Old Washington State University WSU Cougar Crew Pinback Button, Pin.  It has some wear and a few light scratches on it.  There is a little tarnish on the back of it.  The button has a diameter of 1 3/4 inches.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (480.751n-.4px2)