For your consideration, here is a Vintage 2008 Ellensburg Rodeo and Kittitas County Fair Pinback Button, Pin, from Washington.  It has some wear and light scratches on it.  There are some corrosion spots on the back.  The button has a diameter of 2 1/2 inches.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (570.18w-.4px2)