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 ...

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 ...

2010 — Ken Griffey Jr. announces his retirement after 22 seasons in the major leagues. Hitting only .184 in part-time duty for the Mariners, he retires with 630 career home runs and six seasons of 40 ...

Though Ken Griffey Jr.’s 1989 Upper Deck rookie card is by far his most famous card — and among the most iconic in history — it isn’t his most valuable card. That distinction currently ...

(AP) — Ken Griffey Jr.’s wife, Melissa ... “I think I’m probably best at shooting baseball because I understand it so well,” said Griffey, who played 22 big league seasons with four ...