This did not prevent a large number of regional companies from producing successful runs of trading cards. Additionally, several U.S. companies attempted to enter into the market at a national level. In 1959, Fleer, a gum company, signed Ted Williams to an exclusive contract and sold a set of cards featuring him. Williams retired in 1960, forcing Fleer to produce a set of "Baseball Greats" cards featuring retired players. Like the Topps cards, they were sold with gum. In 1963, Fleer produced a 67 card set of active players (this time with a cherry cookie in the packs instead of gum), which was not successful, as most players were contractually obligated to appear exclusively in Topps trading card products. Post Cereals issued cards on cereal boxes from 1960 to 1963 and sister company Jell-O issued virtually identical cards on the backs of its packaging in 1962 and 1963.