President George Washington’s 1789 proclamation establishing the first Day of Thanksgiving is set to be auctioned in New York City. The document will be sold Nov. 14 at Christie’s. The only other known copy of the proclamation is at the Library of Congress, the auction house said.

The proclamation, which set the first national day of thanksgiving for Thursday, Nov. 26, 1789, is estimated to sell for $8 million to $12 million. It’s being sold by a private American collector.

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