For your consideration, here is an WWII Era IAM Aviation Division, District 751 Pinback Button, for the International Association of Machinists. It has some wear, scratches and nicks on the front. The back is pretty rusty. The diameter of the button is 1 1/4 inches. Item pictured is the actual item up for sale and comes from a non-smoking household. (240.274p-.3bx)