The giant letters that spelled "Yankee Stadium" atop the original Bronx ballpark failed to find a buyer at an auction in New York.
They were estimated to fetch between $300,000 and $600,000 at Sotheby's Wednesday night.
Yankee legend Reggie Jackson bought the iconic 10-foot-high sign after the Yankees' last game at the stadium in 2008.
The letters had adorned the ballpark, which was built in 1923, since 1976. They were there when Jackson hit three consecutive home runs in the sixth game of the 1977 World Series.
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The 68-year-old Hall of Famer said he wanted "a new generation to own and enjoy this icon of the Yankees and of New York City."
The letters range from 2 to 10 feet in width, and light up electric blue.