One of the most unique Ken Griffey Jr. items in my collection, this card was found exclusively in Home Team Advantage (HTA) packs of 2001 Stadium Club. Available as redemptions only it is unclear how many of these exist of each player, but they are extremely difficult to track down.
The "Play at the Plate" relics contain authentic game-used batter's box dirt, although the back of the card doesn't identify where the dirt was used so it could be from a local high school field. Regardless, if a card has Griffey on it I will try and track it down, and this is another step towards owning every piece of Junior memorabilia available (still need: game-worn hat, game-used fielding glove and Mariners patch). A very cool card, and a concept that was never used again (except for Topps American Pie which produced "mud cards" from Woodstock), perhaps blogger Brian of Play at the Plate fame will start to hunt these down. There were also "King of the Hill" inserts from this set that featured authentic dirt from the pitcher's mound, which are even harder to find. What do you think of these cards?