Rjkstamps RO173b Swift & Courtney US Revenue Match Private Die Proprietary

The product is a 1 cent US revenue stamp issued between 1861-1870, featuring a blue color and match topic. It is a used stamp with a proprietary design, specifically from the Swift & Courtney company. This stamp is uncertified and ungraded, offering collectors a piece of United States history related to back of book revenues.