So I have a 5"x7" version of a 1991 Upper Deck Ken Griffey Jr. #555 card. The only difference, other than it's size, is that instead of a hologram on the back, it has a gray diamond.
It's hard to remember, because I was only 8 or 9 at time, but I believe it came as a topper in a box of 1994 Upper Deck Collector's Choice that my grandmother gave me. I seem to remember it being sandwiched a couple sheets of styrofoam and placed above or below the packs. It makes sense because I have a bunch of 1994 Collector's Choice in my childhood collection. I find it odd that a variation of a 1991 card would be placed in a 1994 product though. I haven't found much info on the card, but there's also an autographed version. I don't think I've ever found the card in any of the various databases out there though(including this one).
Anyone have any more info on this card?