Here are the nice airmail labels from Bophuthatswana.
Bophuthatswana (meaning gathering of the Tswana people), officially the Republic of Bophuthatswana was a Bantustan – an area set aside for members of a specific ethnicity – and nominal parliamentary democracy in the northwestern region of South Africa. (wikipedia)
Year: approx.1987, Gummed. Günter Mair's catalogue no: - BOP-A-1, rouletted H, vertical strips of
10, violet-grey-blue/white, 2**
Year: approx.1987, Ungummed. Günter Mair's catalogue no: - BOP-A-2, perforated H 10, vertical strips of 17, light blue/white, 2**