Ken Griffey Jr. Upper Deck Rookie Card ... and we should continue to see the value of his cards ascend as does the team.” Tips for Those Curious About Baseball Cards as an Investment While ...

Thursday marked the birthday of arguably the most iconic Seattle Mariners of all time and a Baseball Hall of Famer.

an Upper Deck Ken Griffey Jr. Rookie card could be a very wise investment. Depicting the iconic slugger showing off his trademark grin, this particular card has “exploded [in value] in recent ...