"Envelope with two letters inside, St. Thomas 5 March 1875 to Philadelphia via New York. Forwarded in St. Thomas, agents cachet "FORWARDED BY / G. W. SMITH & Co. / ST. THOMAS W.I." and sent through the British Post Office in St. Thomas "C 51" canceling a 4d plate 14. NY "DUE 10C U.S. CURRENCY MAR 18". A letter inside is dated s.s. „VILLE DE BREST"."