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Complete letter sheet sent from St. Thomas 25 January 1879 to Saint-Pierre, Martinique. 12 cents I printing tied by datestamp ANT2 'ST. THOMAS 25/1 1879', routing instruction RMSPC ‘ PAR EIDER ’. EIDER left St. Thomas 26th of January and arrived at Martinique en route to Barbados, reception mark on reverse MARTINIQUE * ST. PIERRE * 28 JANV. 79.12 cents 1st transitional UPU rate from 1.9.1877 - 1.4.1879, a rare example of 12c Intra- Caribbean rate, only two such letters recorded in the census with 12c single franking. The 12 cents was the first UPU rate and lowered to 10 cents on 1.4.1879.