The 1998 Upper Deck Baseball Ken Griffey Jr's Home Run Chronicles Ken Griffey Jr #55 trading card is a collectible item featuring Ken Griffey Jr from the Seattle Mariners. This original card, manufactured by Upper Deck in 1998, is part of the insert set "Ken Griffey Jr.'s Home Run Chronicles" and is made of card stock with a thickness of 20 Pt. It is a standard size card in English language, depicting a scene from the Major League Baseball season of 1998. This sports trading card is a sought-after piece for baseball fans and collectors looking to add a piece of baseball history to their collection.