The greatest pitcher of the modern day reached two exclusive milestones when he became the 21st pitcher in history to record 300 wins, and struck out his 4,000th victim in the same game. The offered baseball was used in that all-important milestone game, and signed and inscribed by Clemens on the sweet spot, "Roger Clemens / 300 wins / 4,000 K's." Official Major League Baseball shows nice use and also bears the Yankees' "100th Anniversary" stamp. Signature grades "9" out of a possible 10.