For your consideration, here is a 1989 National Coin Week American Numismatic Association Pinback Button, April 16 to 22, Colorado Springs, Colorado.  It has a little wear on it and some tarnish on the back.  The button has a diameter of 2 inches.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (347.320z-.4px2)