Its first baseball card set was produced and ready in time for the 1981 season .
Donruss and Fleer negotiated deals with Major League Baseball and by late 1980 Donruss had acquired the rights to produce baseball cards .
Donruss ' first baseball card set was produced and ready in time for the 1981 season .
Donruss and Fleer negotiated deals with Major League Baseball and by late 1980 Donruss had acquired the rights to produce baseball cards .