Cleveland "Steamboat", bold strike straightline with matching "Due 6" straightline and "Cleveland O Jul 16" duplex ties 3¢ rose (65) on yellow cover to Sewickleyville Pa., endorsed "Mail direct via Pittsburgh" at top left, Very Fine. Estimate  $100 - 150. Although prepaid, the 1863 Act required steamboat letters to be prepaid 6¢. The 3¢ prepayment was disallowed as a result and letter marked "Due 6". $0 (Image)