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No stamp, no information on bottom.
That should be a Discraft disc, then. All of the old discs were licensed by Innova because they owned the patent, the # is the same no matter who made the disc. Dcraft is the company that put the molding on the inside rim.Umm well, I found an Innova patent on the inside rim. "Licensed under U.S Patent no. 4,568,297"