By CBS3 Staff

PHILADELPHIA (CBS) — A piece of Philly’s, and the nation’s, history is going up for auction! It’s an extremely rare and official first-edition printed copy of the U.S. Constitution.

You may recall the Founding Fathers adopted it at a convention in Philadelphia in 1787.

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Sotheby’s, a fine arts company, is putting it up for bid in mid-November.

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The copy’s estimated value is between $15 and $20 million.

Only 11 like it survive today, and this copy is the only one not in a permanent institutional collection.

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