Ken Griffey Jr. Autographed 1989 Upper Deck Rookie Card #1 Seattle Mariners Auto Grade Gem Mint 10 Test Proof Error With Thad Bosley Beckett BAS #10383178

This is a 1989 Upper Deck Rookie Card #1 that has been hand signed by Ken Griffey Jr. The condition of the signature was graded a Gem Mint 10 by Beckett BAS. Please note, this is an error test proof card. The back of this card features both the front of a Thad Bosley 1989 Upper Deck card and the back of the Ken Griffey Jr. 1989 Upper Deck card. There is also missing card stock on the front of this card as shown. It has been certified authentic by Beckett Authentication Services (BAS) and comes encapsulated in their tamper-proof holder.