This is a one-of-a-kind Mariano Rivera signed baseball with the 1999 World Series logo and authentication by Steiner Sports. This autographed ball is the perfect addition to any New York Yankees or baseball memorabilia collection. The signature is clear and bold, making it a true standout piece. This baseball is sure to be an impressive conversation starter whether displayed in a case or used for a game of catch. Don't miss your chance to own a piece of Yankees history.