For your consideration, here is a Give Pedestrians A Brake Pinback Button, Pin, from Grays Harbor County, Washington.  The button has a diameter of 1 3/4 inches.  It has some wear on it.  There is a lot of tarnish on the back of it.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (694.7c15f-.3px1)