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one of a kind

recently trying to clear up my collection and discovered "error" card that I have not been able to find out any information on. This card is from the error heavy 1991 topps baseball. Description: #43 Roger McDowell on the front and off-cut stats of Rick Mahler on the back. I have been looking information on this, with no luck. Is this truly one of a kind and be worth grading or just put along with the rest of set. Thanks for any assistance.


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