For your consideration, here is a Vintage I Was There At The Puyallup Fair Name Pinback Button, Pin.  It has some wear and scratches on it.  There is tarnish on the back of it.  The button has a diameter of 3 3/8 inches.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (450.822w-.4px2)

 

[Thanks for looking!]