NIGER COAST 1893 'HALF PENNY.' on 2½d purple/blue, SG13Niger Coast 1893 (Dec) "HALF PENNY." on 2d purple blue, type 4 surcharge in carmine, Old Calabar provisional, tied to piece by 'OLD CALABAR RIVER' circular date stamp, dated "MR 16 94", SG13. A very fine used example. Very Scarce. Stanley Gibbons catalogue value: 475. The main post office of Niger Coast Protectorate was established at Old Calabar in November 1891. Initially, British postage stamps were used. In July 1892, they were overprinted with