Issued in 1970, this Botswana commemorative pair highlights the nation’s early industrial development following independence. The set depicts copper-nickel mining at Selebi-Phikwe and the Orapa Diamond Treatment Plant, both cornerstone projects that shaped Botswana’s economic transformation. Notable for their detailed industrial artwork and strong socio-economic theme, these stamps are sought after by collectors of African development, mining, and industrial history. A solid mid-period topical set with clear historical context and visual appeal.