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The silver-colored Susan B. Anthony dollar was replaced with gold-colored Sacagawea dollar in 2000 and Presidential Dollars 2007-2016; though the composition changed, the coin's size and weight remain the same. Some variances in coin size and weight occurred over time, especially as the value of silver varied.
The Carolingian Pound was superseded by what became the most common coin base weight in Central Europe from the Middle Ages to the 19th century. This was the Cologne Mark of 233.779 grams of silver. [2] Silver coins of different weights were minted from this standard weight.
The Quarter-Dollar, Half-Dollar and Dollar coins were issued in the copper 91.67% nickel 8.33% composition for general circulation and the Government issued six-coin Proof Set. A special three-coin set of 40% silver coins were also issued by the U.S. Mint in both Uncirculated and Proof.
The Silver Eagle coins were sold out in the first week of July 2015. The Mint said its facility in West Point, New York, continued to produce coins and it resumed sales at the end of July 2015. This was the second time the mint's silver coins had sold out in the past nine months. The Mint ran out of 2014-dated American Eagles in November 2014.
Between 1997 and 2012 silver bullion coins have also been produced under the name "Britannias". The alloy used was Britannia silver (millesimal fineness 958). The silver coins were available in 1 troy ounce (31.1 g), 1 ⁄ 2 ounce, 1 ⁄ 4 ounce and 1 ⁄ 10 ounce sizes. Since 2013 the alloy used is silver at a (millesimal fineness 999).
A new coining press from Germany, the Grabener 1000 press, was installed on March 1, 2010, at the Philadelphia Mint for use in producing the America the Beautiful Silver Bullion Coins. The press provides up to 1,000 metric tons (1,100 short tons ) of pressure for each strike and can produce in excess of 1 million coins per year.