Stellar action photo of Hall of Fame legend Christy Mathewson, circa 1909-10 at the Polo Grounds. Mathewson is shown in follow-through having just released a pitch in this classic 5x6.75" image. A couple of corners are chipped and there is minor creasing not affecting presentation. Reverse has pencil notations and stamps from noted photo archivists Brown Brothers. PSA Type I encapsulated.