Sierra Leone has issued commemorative coinage under its own authority since independence in 1961, but the "Big Five" wildlife series belongs firmly to the modern bullion-adjacent collector market — produced in Virenium, a proprietary copper-zinc-nickel alloy developed by the Pobjoy Mint, which has struck the majority of Sierra Leone's collector issues for decades under contract.
Sierra Leone has issued commemorative coinage under its own authority since independence in 1961, but the "Big Five" wildlife series belongs firmly to the modern bullion-adjacent collector market — produced in Virenium, a proprietary copper-zinc-nickel alloy developed by the Pobjoy Mint, which has struck the majority of Sierra Leone's collector issues for decades under contract.