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I have some discs from the 80s and I am trying to figure out value on them any input would be helpful thanks. This one is a San Marino Big Bird roc 180 g
Yes there is a patent # on it, I belive the letters on the back are large block. I put up next to an old Cobra and it's the same size, and the rims look alike, but with a bead on the Cobra. So maybe an early or retooled Cobra.