His baseball cards, especially his rookie cards, have been invaluable and highly sought after by collectors since the late 1980s. Here’s a list of Ken Griffey Jr.’s most valuable cards.

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 ...

Legendary baseball player Ken Griffey Jr. continues to captivate fans and collectors alike with his exceptional talent and lasting impact on the sport. One of his most coveted collectibles, the ...

Coming in at the top spot is a 1990 Topps rookie card with a ton of errors and misprints. The card is a true 1/1, making it $700,000. Next on the list is another 1990 Topps rookie card for $399,999.

Ohtani ranks No. 2 only behind Hall of Famer Ken Griffey Jr. for the most baseball cards graded by industry leader PSA (Professional Sports Authenticator) and led all players with the most cards ...