Not postally used. No date information on card, but reference to "Jack Dempsey's Great Northern Hotel" on the back would indicate somewhere in the 1940's. Corner crease in upper right, dinged upper left corner . The word "Advert" and an arrow are written on the back in pencil. Front depicts a James Mongomery Flagg illustration of Dempsey becoming the champ vs Jess Willard. Back has an advertisement for a professional wrestling event where Dempsey would be serving as the referee.