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A ''nickel'', in American usage, is a five-cent coin struck by the United States Mint. Composed of 75% copper and 25% nickel, the piece has been issued since 1866. The silver half dime, equal to five cents, had been issued since the 1790s. The American Civil War caused economic hardship, driving gold and silver from circulation; in response, in place of low-value coins, the government at first issued paper currency. In 1865, Congress abolished the five-cent fractional currency note after Spencer M. Clark, head of the Currency Bureau (today the Bureau of Engraving and Printing), placed his own portrait on the denomination. After successful introduction of two-cent and three-cent pieces without precious metal, Congress also authorized a five-cent piece consisting of base metal; the Mint began striking this version in 1866. The initial design of the Shield nickel was struck from 1866 until 1883, then was replaced by the Liberty Head nickel. The Buffalo nickel was introduced in 1913 as part of a drive to increase the beauty of American coinage; in 1938, the Jefferson nickel followed. In 2004 and 2005, special designs in honor of the bicentennial of the Lewis and Clark Expedition were issued. In 2006, the Mint reverted to using Jefferson nickel designer Felix Schlag's original reverse (or "tails" side), although a new obverse, by Jamie Franki, was substituted. As of the end of FY 2013, it cost more than nine cents to produce a nickel;〔(【引用サイトリンク】url=http://news.coinupdate.com/us-mint-cost-to-make-cent-and-nickel-declines-3113/ )〕 the Mint is exploring the possibility of reducing cost by using less expensive metals. == Background == (詳細はhalf disme (as the half dime, pronounced the same, was first called) was one of the denominations prescribed by the Mint Act of 1792, its weight and fineness were set by law. The first pieces under federal authority were half dismes, struck in 1792 in the cellar of John Harper, a saw maker; as the first federal mint was still under construction in Philadelphia, this took place locally at Sixth and Cherry Streets. The dies were engraved by Adam Eckfeldt, who a half-century later recalled the silver for the half dimes was supplied by President George Washington, and that the 1,500 coins struck from the bullion were given to Washington's Secretary of State, Thomas Jefferson, for distribution to important people, both in the US and overseas. By legend, President Washington supplied silverware from his home, Mount Vernon, to provide bullion for the coins. In his annual message to Congress in late 1792, Washington noted the ongoing construction of a mint building and stated: "There has also been a small beginning in the coinage of half dimes, the want of small coins in circulation calling the first attention to them." In 1793, the newly established Philadelphia Mint began striking cents and half cents. Coinage of precious metal was delayed; Congress required the assayer and chief coiner to each post a security bond of $10,000, a huge sum in 1793. In 1794, Congress lowered the chief coiner's bond to $5,000, and the assayer's to $1,000; President Washington's appointees to those positions were thus able to qualify and take office. Subsequently, silver coinage began that year. The half dime was struck to various designs by Mint Engraver Robert Scot from 1794 until 1805, though none were dated 1798, 1799, or 1804. By 1804, silver US coins were heavily exported, as they could be exchanged at par in the West Indies with heavier Spanish coins, which were then imported as bullion and deposited at the Mint for melting and restriking. In response, in 1804 the US stopped striking silver dollars; issuance of the half dime was discontinued from 1805 until 1829. In 1807, mint Director Robert Patterson in a letter explained to Jefferson (by then president) "nearly the whole of our Silver Bullion (chiefly Spanish dollars) come through the Banks, and it is very seldom that they will consent to take any coin less than half dollars." Beginning in 1829, the silver five-cent piece was again struck; beginning in 1837, its fineness was increased from .8924 to .900. Also in 1837, the half dime's obverse design changed from one by William Kneass, depicting a bust of Liberty, to one that featured a seated Liberty by Christian Gobrecht; until its abolition in 1873, the half dime would bear modifications of this design. In 1851, it ceased to be the smallest US silver coin as a three cent piece was issued by the Mint. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nickel (United States coin)」の詳細全文を読む スポンサード リンク
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