I never seen one in my travels. But I believe it is for certified aaa mechanics. Kinda like he can be trusted and aaa cleared him. There was probably a book with all of them in and aaa gave them out like with a map or so. That way you knew where they were on a map if you had car trouble. Kinda of unusual. Mostly I see the aaa police type badges. Enameling is nice on it yet. I am guessing probably the size of a half dollar or quarter.