Letter sent from P. Camp to Paris through the British Post Office at St. Thomas 23 October 1871, franked at St. Thomas with 3 and 4d tied by C51 vertical format, showing 1-ring “St. Thomas PAID A” in red, London transit mark and exchange office “Angl. Amb. Calais F”. Round corner at 3d stamp and interesting plate flaw at 4d stamp, vertical fold in cover not affecting the stamps.