For your consideration, here is a Superhuman Samurai Syber-Squad Samaurized Guys! Pinback Button, Pin.  The button has a diameter of 2 7/8 inches.  It has wear on it.  There is tarnish on the back of it.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (702.12c13g-.3px1)