1974, Sierra Leone. Large Proof Silver Leone CoinMint Year: 1974Reference: KM-26aMintage: 22,000 pcs. Denomination: 1 LeoneMaterial: Silver (.925) Diameter: 38mm Weight: 269gm Siaka Probyn Stevens (24 August 1905 – 29 May 1988) was the leader of Sierra Leone from 1967 to 1985, serving as Prime Minister from 1967 to 1971 and as President from 1971 to 1985. Stevens' leadership was often ...