This is it. Unquestionably and without hyperbole, the single most important event in baseball history, as it happened, on Opening Day, April 15, 1947. What at first glance appears to simply be a Type I photo featuring a fantastic overhead shot of Ebbets Field, reveals so much more upon close inspection. At the plate stands Jackie Roosevelt Robinson, stepping into the box for his first official major league at bat, as Boston Braves catcher, Phil Masi settles in. It was at this very moment that major league baseball became integrated, ending nearly six decades of segregation and racial intolerance in the sport. Several Type I photos exist within the hobby from Jackie's earliest days with the Dodgers and the pre-season spring series played between the Bums and New York Yankees where Jackie first debuted in a major league uniform. Several Type I photos also exist from April 15 prior to Jackie's first official game, as Jackie and teammates posed for photographers. Incredibly, as far as we're aware, this photo represents the only known Type I example to depict Jackie during his first official major league at bat, launching the civil rights icon's storied eleven-season Hall of Fame career. Significant 7" x 9" photo displays typical light handling wear associated with working news service photos stored in archives for decades, with pinholes present to all four corners. Included paper caption, affixed with clear tape on verso, and dated to Opening Day on 4/15/1947, states: "The stands at Ebbets Field are jammed as Jackie Robinson comes up to bat in the first inning of the initial tilt." Verso displays credit stamping from both United Press News, and Acme, who initially issued this photo. Authenticated and encapsulated as a Type I photo by PSA/DNA.