Original glass plate negative, culled from the legendary Brown Brothers Photo Archives, capturing Christy Mathewson as a member of the New York Giants, circa 1910. Mathewson is pictured warming up on the sideline prior to a game at the Polo Grounds, with an unidentified member of the Giants pictured in the background. While it is impossible to say how many original Type I photos of this image have survived, there is only one original negative, which makes it a true "one of one." The negative (5x7") displays areas of emulsion loss along the borders and is otherwise in Excellent condition.