On July 10, 1999 At Leland’s “Hero’s Auction’ of sports memorabilia held in New York, the ball batted by Carlton Fisk in the 12th inning of Game 6 of the 1975 World Series which hit the Fenway Park foul pole, ending one of the most dramatic games in World Series history, is sold for $113,273. George Foster, the Reds’ left fielder who retrieved and kept the historic home run ball, decided to sell the souvenir after realizing its potential value after Mark McGwire’s 70th home run ball sold for almost $3 million.

Source

Baseball Reference July 10