1989 Upper Deck # 1 Ken Griffey Jr. Seattle Mariners (Baseball Card) PSA PSA 8.00 Mariners. Deans Cards was founded in 2001 by Dean Hanley, a fellow card collector, and has become the leading online seller of vintage sports cards and non-sports cards. Our inventory has grown to more than a million vintage cards and we have a staff of 14 employees and a 5000 sq. ft. office space in Cincinnati, Ohio to offer you quick and personal service. Dean also has written two books on collecting vintage baseball cards. If you will give us the opportunity to earn your business, you will be glad that you did. We guarantee it!SN: 16A 00 0619