Issued by the Republic of South Africa (Republiek van Suid-Afrika) in 1966, this striking 1-cent commemorative stamp marks the 5th anniversary of the Republic (1961–1966). The modernist design features a stylized, faceted diamond—symbolizing South Africa’s renowned mining heritage—set against geometric fields of green, gold, and black. These colors reflect both the nation’s landscape and its flag palette of the era. The stamp stands out for its minimalist composition and strong symmetry, emblematic of 1960s design aesthetics.