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A science that identify the monetary bills,coins and medals,analyze their components and set then in the chronology, in the geography, history and their style. Before the coin invention in the VII a. C. century, all trade operations were done in a bartening basis or using a weight balance as a measure for precious metals. The numismatic is of great valve for Archeology and History. Coins found at archeological sites when identified allows position other objects found in the same site. The study of coins also allows the recreation of economic aspects of the human culture. The numismatic person. Therefore is someone that research among the bills a wide knowledge such as History, Metallurgy, Art, etc. By the same token the diversified mintage, with images, symbols, exchange value, make coins, historic. Documents of relevant importance: a example is artistic representation of Zeus of Fídias minted in a brass roman coin, from Adrian. In the it beginning the coins didn't have a definided and regular form, but slowly the circular and flatmetalic shape was gainining popularity in the accident, being the most common, followed by the ovals, hexagons and rectangles formats, however square, polygons and pierce coins were also used in the orient, and otheis materials like porcelain were used too. The mintage, coarse, chumsy and just in one side in the beginning, give away space for new images occupying all the area of both sides, including decorated elements on the side made with the purpose of avoiding reduction of the thickness through filling. Most common materials used to produce coins were the electro, gold, silver, brass and aluminium. The electro was a combination of gold and silver, utilized by the lidios. The first gold coins, called crescida, were minted by Cresus, king of Lídia, and the persican daric, VI b.C century, and the Etater of Egina the first silver coin. The earliest coins of the roman period were minted in brass, called "aes", related to the pound weight and their submultiples. The Brazilian monetary standard was originated from the portuguese Real minted in silver by D. João I. Continuous and successives devaluations made up the thousand "réis" standard, origin of the cruzeiro. In Brazil the dutchs minted coins in Recife and the portuguese started a coins House in Salvador, Bahia state, in 1695. Nowadays are produced through mechamical means reducing it's artistic value if comparing then with what was done in the past.
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