The carpet was part of a collection bequeathed to Corcoran in 1926 by William A Clark, an industrialist and U.S. senator from Montana.
The previous record price for a carpet was $9.6 million for a Persian carpet sold by Christie’s in London in April 2010.
The Sickle-Leaf carpet measures 8 feet 9 inches by 6 feet 5 inches.
The price includes the auction house’s premium.
To see the carpet, click http://www.sothebys.com/en/auctions/ecatalogue/2013/so-rugs-n09012/lot.12.html