(Retaliatory Rates) 1848 (Sep. 15) Gilbraltar to Petersburg, Va. via London, folded letter endorsed "via Boston or New York first steam packet", "Gibraltar, SP 16 1848" cds and "Gibraltar-Paid" h.s. with red manuscript "2" shilling prepaid rating for the single rate, red London "Paid 23 SP 1848" cds and Liverpool (9.25) transits, carried by Cunard Line Britannia from Liverpool Sep. 30 to New York arriving Oct. 17, blue "68" rating marked in error as double-weight due; Very Fine and rare retaliatory use from Gibraltar. Estimate  $300 - 400. Letter carried from Gibraltar to Southampton by P&O Steamer "Montrose" and across the Atlantic on 15th of 25 Cunard mail voyages to the U.S. under the retaliatory order. Prepayment consisted of 1 shilling packet fee to England and 1 shilling packet fee to U.S. New York thought letter prepaid 2 shillings as double rate and charged 2x34¢ postage due, or twice the 24¢ retaliatory fee plus 10¢ inland fee. $0 (Image)