1848, letter sheet from New York (docketed inside) with 'British open mail' to Basle, Switzerland, endorsed "P.Steamer Niagara" (Cunard Line) and "Via Paris" during the Retaliatory-rate period, thus to be prepaid (not noted) with 29 c.; in Switzerland charged with "54" kreuzer, including 10 d. british transit and 17 dec. double rate french postage.
