As minted by the Casa da Moeda do Brasil (Brazilian Mint) for the Banco Central de Paraguay in 1976. According to Krause's Standard Catalog of World Coins, 12,000,000 pieces of the One Guarani and 10,000,000 pieces of the Ten Guarani business strike were produced but only 1,000 proofs of each were made. They are listed as KM-151 and KM-153 respectively and come in a presentation case with a Certificate of Authenticity. This two coin set is bound to be a prized addition to any collection of world coins.