In 1987, worked for Green Duck for only about a month. I worked in the capacity of a graphic artist/designer. At that time, the firm made and struck slot tokens, pinback buttons, etc. I had a problem with their management style not long after I came there, so I told 'em I'd give them two more weeks, and then adios!

I could see that the metal coin centers of the chips may have been manufactured by Green Duck, but probably not the outer composition ring.