Bolivia, Charles IV. Colonial Silver 4 Reales Coin. Denomination: 4 Reales Mint Mark: Potosi (Bolivia) Reference: 1804-PJ, KM-72 ($175 in VF!). R! Weight: 13.18gm Diameter: 34mm Material: Silver Obverse: Laureate, draped, and cuirassed profile bust of Charles III with roman armor right. Latin Legend: CAROLUS . IIII . DEI . GRATIA . 1804 Translation: “Charles IV by the Grace of God, 1804” Reverse: Crowned Spanish* arms between the Pillars of Hercules adorned with PLVS VLTRA motto. Legend: .HISPAN[IARUM].ET IND[IARUM].REX.Ptsi[Potosi Monogram].4R [EALES] P.J.[Assayer Initials] Translation: “King of the Spains and the Indies, Potosi [Mint], 4 reales”. The Spanish dollar (also known as the piece of eight, the real de a ocho, or the eight real coin) is a silver coin, worth eight reales, that was minted in the Spanish Empire after a Spanish currency reform of 1497. It was legal tender in the United States until an Act of the United States Congress discontinued the practice in 1857. Through widespread use in Europe, the Americas and the Far East, it became the first world currency by the late 18th century. Many existing currencies, such as the Canadian dollar, United States dollar and the Chinese yuan, as well as currencies in Latin America and the Philippines peso were initially based on the Spanish dollar and other 8 reales coins.