cover 3c Dull Red, shades (11), three singles, large margins to slightly in, each used on separate covers with different Steamboat Route Agent Markings: one tied by blue "U.S. Mail Packet Natchez" oval h.s. with second blue "Route 7309" double oval h.s., another (with ms. cancel) tied by blue "Route 7309" double oval h.s., the third tied by "7309" ms. marking (actually quite scarce), fine-very fine strikes photo ex