50 Cauris

Guinea's 1971 coinage series was issued three years after Sékou Touré's government severed the country from the West African CFA franc zone, a politically motivated break that required Guinea to field its own independent currency. The syli system introduced that year replaced the Guinean franc, with the cauri as its subdivision — the name itself a direct reference to the cowrie shells historically used as currency across West Africa.

Aluminium was the only practical choice for low-denomination coinage in a country that had deliberately isolated itself from French monetary infrastructure and was facing chronic shortages of hard currency reserves.