Here is the first airmail label from Transkei.
The Transkei, officially the Republic of Transkei, was a Bantustan—an area set aside for members of a specific ethnicity—and nominal parliamentary democracy in the southeastern region of South Africa. Its capital was Umtata (renamed Mthatha in 2004).(wikipedia)
Year: approx.1980, Gummed. Günter Mair's catalogue no: - TSK-A-1, rouletted H, vertical strips of 10,blue or greenish blue/white, 2**