Handwritten letter on a sheet of hotel stationary has been signed “Sincerely, Jackie Robinson.” It is addressed to Warren Giles, then President of the National League, and was written as an apology for his on-field conduct after disagreement with a call by umpire Augie Guglielmo during the Dodgers vs. Reds July 17, 1952 game at Crosley Field. Robinson writes, “I am very sorry for my unsportsmanlike conduct and I hope you accept my apology. I don’t stop to think until it’s over and then I realize everyone is doing his best. Please convey my thoughts to Augie Guglielmo and say I am very sorry as it certainly was not the thing to do. In closing I just want you to know I’ll do all possible to control myself as I know just how it looks and realize it brings no credit to me or baseball.” Coincidentally Guglielmo had been behind home plate just weeks before when Robinson stole home during a game at Ebbets Field and was called safe (one of a remarkable 19 times he accomplished the rare feat). Among the more interesting Robinson letters dating to his playing days which we have seen offered. Typical mailing folds with a touch of other modest wear and toning. Authenticated and encapsulated by PSA with the autograph graded PSA/DNA 10 Gem Mint: Gem Mint