During the heyday of one of most memorable and iconic toy stores,Toys R Us, got together up with Topps between 1987 and 1991 to produce mini sets of baseball cards to highlight the years' rookies.
1990 saw one of that years' best Rookies of all time: Ken Griffey Jr. The collectors sets came packaged in a box of 33 cards, with Ken Griffey Jr.'s card being #13.