For your consideration, here is a Vintage Try-Met Trimet Transit Portland, Oregon Promotional Pinback Button, Pin.  It has a little wear on it.  There is some tarnish on the back.  The button has a diameter of 1 1/2 inches.  It will be mailed in a box for protection.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (442.822v-.4px2)