Spanish colonial real
The silver real (Spanish: real de plata) was the currency of the Spanish colonies in the Americas and the Philippines. In the seventeenth century the silver real was established at two billon reals (reales de vellón) or sixty-eight Spanish maravedís. Gold escudos (worth 16 reales) were also issued. The coins circulated throughout Spain's colonies and beyond, with the eight-real piece, known in English as the Spanish dollar, becoming an international standard and spawning, among other currencies, the United States dollar. A reform in 1737 set the silver real at two and half billon reals or eighty-five maravedís. This coin, called the real de plata fuerte, became the new standard, issued as coins until the early 19th century. The gold escudo was worth 16 reales de plata fuerte.
After the independence of Spain's colonies, the real was replaced by currencies also denominated in reales and escudos, including the Argentine real, Central American Republic real, Ecuadorian real, Honduran real, Paraguayan real and Santo Domingo real.
From 1572 to 1773 Spanish colonial silver coins were cobs. Initially cut from a silver bar and hammer struck on a coin die, they were accurate in weight, though sometimes debased in precious metal content. However unlike machined coins such as the one shown, they were often irregular in shape, especially if a too-thick coin was clipped by the mint to reach the proper weight. After 1732 similar, but better shaped cobs were produced on screw presses. Cob denominations were 1/2, 1, 2, 4, and 8 reales. When circulating in New England the larger coins might be cut to give intermediate values; since a reale was nicknamed a "bit", the expression "two bits" came to mean a quarter dollar.
Unlike in Spain, the copper coins were generally not struck by the colonial mints. Most issued silver coins in denominations of ¼, ½, 1, 2, 4 and 8 reales and gold coins for ½, 1, 2, 4 and 8 escudos. Exceptions were the Santo Domingo mint, which did strike maravedís in the sixteenth century and the Caracas mint which issued fraction of real copper coins in the early nineteenth century to facilitate commerce.
See also 
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