Featured is a Ken Griffey Jr. signed Seattle Mariners 1989 Upper Deck #1 Rookie card. This card has been hand signed Seattle Mariners by Griffey and has been slabbed and authenticated by Beckett. This card would make a great addition to any sports memorabilia collection!. SPECIFICATIONS Autographed By: Ken Griffey Jr. Team: Seattle Mariners Sport: Baseball Authentication: Beckett Grading Services