For your consideration, here is a 1987 - 88 Seattle Seafair Pirates I’ve Walked The Plank Pinback Button, Pin.  The button has a diameter of 2 1/4 inches.  It has some 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.  (694.7c9g-.3px1)