The key card from this scarce and imaginative set which features two different images revealed by using the "Push-Pull" tab on the bottom to move the louvered shutter. Only three cards in the 36 card set feature baseball players and this card is the most valuable and desirable featuring two HOF members and all-time Yankee legends. Positioned so the Mantle image is showing. Bio for each on back. Card is larger format, 2.5x5.25". Cards were easily worn w/intended use and the black borders easily show color rubs making this example all the more appealing in its grade of 60 EX.