Postage stamps and postal history of Biafra from the 1965 issue were issued overprinted with the Biafran coat of arms and the words SOVEREIGN BIAFRA. The 1/2d and 1d values from the same 1965 Nigeria series also exist surcharged with new values and overprinted BIAFRA-FRANCE FRIENDSHIP 1968 SOVEREIGN BIAFRA</small> but these stamps are not believed to have been used for postage. A number of further stamps were issued in 1968 and 1969 inscribed BIAFRA or REPUBLIC OF BIAFRA, including miniature sheets, further overprints and stamps ostensibly issued to raise funds for charity. Postage stamps and postal history of Biafra This is a survey of the postage stamps
Bight of Biafra Guinea (Bioko Island and Rio Muni), and Gabon (northern coast). The Bight of Biafra accounted for 13% (1.6 million) of the total number of slaves exported from the Western African coast. The Bight of Benin to the west accounted for 17% while Central Africa to the south accounted for 48%. By the middle of the eighteenth century, Bonny had emerged as the major slave trading port on the Bight of Biafra outpacing the earlier dominant slave ports at Elem Kalabari (also known then as New Calabar) and Old Calabar. These 3 ports together accounted for over 90% of the slave