100 Sylis

Guinea's Sylis was introduced in 1971 when the country severed all monetary ties with the French Franc zone, a deliberate act of economic nationalism under Sékou Touré's one-party state. The Sylis replaced the Guinean Franc at par and was intended as a clean break — though chronic foreign exchange shortages meant the official rate bore little relationship to what the currency actually commanded outside state institutions.

By 1980, Guinea's economy was under severe strain, and the Sylis itself would not survive the decade. After Touré's death in 1984 and the subsequent military takeover, the currency was abolished and replaced by a reconstituted Franc in 1985.