faint red "Halifax Paid Au 23 1848" origination postmark, prepaid "1/-" at Halifax, carried on Cunard's Britannia departing Halifax August 23 and arriving Boston August 26, rated "29" due on arrival (24c Retaliatory rate plus 5c inland postage), light wear and toning, still fine and scarce, the retaliatory rate applied to all foreign packets bringing mail into the US regardless of origin and so included British North America