(Retaliatory Rates) 1848 (Dec. 8) London, England to Philadelphia Pa., folded letter bearing G.B. 2d blue, strip of four, margins to touched, tied by "12" oval grid cancels, London (12.8) backstamp and red "Ship-Letter, London, DE 8, 1848" cds on front, endorsed "per Private Ship", black "Ship-Letter, Liverpool, Dec 10" crown cds on backstamp, Philadelphia blue "6" cent due octagonal handstamp; couple tone spots, F.-V.F. Estimate  $500 - 750. Cover was prepaid 8 pence for the outbound ship letter rate and was 6¢ postage due in Philadelphia for the ship letter rate to port of arrival. $0 (Image)