1994 Upper Deck Mickey Mantle/Ken Griffey, Jr. (DUAL AUTO) / Click image for eBay source listing In 1994 the baseball card scientists at Upper Deck came up with the formula for one of the hottest ...

Skybox E-X Ken Griffey Jr. Essential Credentials Now, #'d 4/10, is at Heritage Auctions. It's the first time the card has been on the open market in nearly 20 years.

According to the Mariner's team checklist on Beckett.com, the card is an insert autograph ... Major League Baseball Hall of Famer Ken Griffey Jr. is introduced prior to the Mariners Hall of ...