There is only 2 Lindy Lindstrom cards known, 1 is canceled like yours if I remember right.
I would think, In order for it (Grove) to be canceled, a complete set would have been redeemed......... including the super rare Lindstrom
Very cool
they would have canceled every one of the cards in set not to give away the chase card, then returned them to kid with prize, I would think the ink on front is from the card above it in stack after they were stamped.
edited...I see Barry answered the same way, maybe I should read the replies before
