Featured in this collection are the single signed autographed baseballs of all 23 players and managers that entered baseball’s Hall of Fame in Cooperstown New York as the Yankee’s being their primary team. Babe Ruth was first in 1936 and Mariano Rivera was the last in 2019.  Incredibly, the only player ever to be inducted unanimously is Mariano Rivera. When Derek Jeter comes up for a vote this year that might change. Although listed as Yankees, Willey Keeler and Jack Chesbro were both NY Highlanders the Yankee predecessor.