1998 and 1999 signed World Series Championship Balls. This lot has (1) 1998 Official World Series Championship baseballs signed by 28 members of the winning Yankee team (a few are clubhouse). There are also (2) 1999 official World Series balls, both signed by 30 players. The signatures include many contemporary baseball superstars and future Hall of Famers such as Derek Jeter, Andy Pettitte, Jorge Posada, Bernie Williams, Paul O'Neill, Roger Clemens, Mariano Rivera and more. All three balls are in excellent condition with a crisp white color and red stitching. .