Two portraits drawn during the Revolutionary War by a British officer-turned-spy linked to Benedict Arnold are being auctioned in New York City.

Swann Auction Galleries in Manhattan on Tuesday is selling John Andre's circa-1776 portraits of Albany Mayor Abraham Cuyler and his wife. The pencil-on-paper sketches are mounted together and being sold as one unit. The estimated sale price is $50,000 to $75,000.

Andre was captured by Americans in Canada in 1775 and was headed to captivity in Pennsylvania when he spent several weeks with the Cuylers and drew their portraits in Albany.

After being released, Andre was put in charge of the British spy network in America. He arranged for Arnold to hand over information on West Point in exchange for money. Andre eventually was captured and hanged.