Letter from Maracaibo 30 April 1873 via St. Thomas 16 May to Vera Cruz, Mexico . British 4d plate 12 cancelled with clear and clean duplex 'C51 ST-THOMAS A / MY16 73 / PAID', routing instruction 'Via San Tomas'. From St. Thomas with RMSPC steamer 'EIDER' 17 May and arriving Vera Cruz 27 May. British packet 4d rate within Caribbean Sea.