In the top of the fifth at the Polo Grounds on Aug. 16, 1920, New York Yankees righthander Carl Mays plunked Indians shortstop Ray Chapman (left) on his left temple with a curve ball. Chapman, 29, died the next day--the first and only death from an on-field incident in major league history. Joel Platt, the executive director of the Sports Immortals Museum in Boca Raton, Fla., claims to have the fatal ball, though, as Leland's CEO Josh Evans says, "the piece has not been acknowledged as being real." According to Platt, Cleveland centerfielder Chuck Jamieson picked up the ball on his way to check on Chapman. In 1969, Jamieson gave it to sportswriter Bob Curley, who donated it to Platt in '83. ESTIMATED VALUE: $100,000 to $200,000.