The New London (CT) Historical Society has recently discovered it owns an American flag that may be worth millions. It's an antique 13 star banner made of faded white and red silk ribbons hand stitched together. It's been part of the Society's collection for decades and until lately hung over the mantle in the front parlor of the Shaw Mansion in downtown New London. In 2006 it was restored by experts in Rhode Island. Gradually, it dawned on them that it was one of only a very small number of 13 star flags. Not even the Smithsonian has one of these rarities "We have come to conclude it is probably a sort of national treasure," says Edward Baker, executive director of the Society. "It may be worth several million dollars. But there are no plans to sell it."