The 1792 half disme (pronounced "deem")  is an American silver coin with a face value of five cents which was minted in 1792. Although it is subject to debate as to whether this was intended to be circulating coinage or instead an experimental issue, President George Washington referred to it as "a small beginning" and many of the coins eventually were released into circulation.   It is widely (although not universally) considered the first United States coinage struck under authority of the Coinage Act of 1792. 
When speaking to the House of Representatives in November 1792, President Washington mentioned the "want of small coins in circulation" and stated that he had begun work on establishing a U.S. Mint and that some half dismes had been produced already. At this point, most of the personnel had been hired, but the Mint's buildings and machinery were not yet ready. As a result, the half dismes, which had been struck in or around July 1792, were produced using the private facilities of local craftsman John Harper, although under the auspices of official Mint personnel. In his personal log book, Secretary of State Thomas Jefferson recorded the receipt of 1,500 specimens on July 13.
Because of President Washington's connection with these early coins, numismatic folklore holds that the portrait on the obverse is that of First Lady Martha Washington and that some of the coins were struck using melted-down silverware from the Washington household.  However, there is no solid evidence for either of these assertions.  To the contrary, evidence uncovered from Thomas Jefferson's memorandum book shows that he provided "75 (Mexican) Silver Dollars" and received the first 1,500 half dismes. He then spent those coins on his trip home to Monticello. 
Although the exact number is not known, it is believed that between 2,000 and 3,500 specimens were produced. Approximately 10% of these survive today; one expert estimated between 250 and 400 half dismes exist, and most appear to have been used in circulation for some time. An about uncirculated (AU55 on the Sheldon coin grading scale) 1792 half disme was auctioned for $138,000 on July 24, 2004.  A 1792 half disme graded MS65 was valued in 2018 on the American reality television series Pawn Stars at $500,000-600,000.  A specimen strike from the Starr collection, graded MS67 by PCGS, sold for $1,322,500 on April 26, 2006.  The highest numerically graded piece, an NGC MS68, sold for $1,500,000 by private treaty transaction in 2007. 
Although nearly all 1792 half dismes were produced in a silver alloy, a unique pattern piece in copper is also known. 
A nickel is a five-cent coin struck by the United States Mint. Composed of cupronickel, the piece has been issued since 1866. Its diameter is 0.835 inches (21.21 mm) and its thickness is 0.077 inches (1.95 mm).
The United States Mint is a bureau of the Department of the Treasury responsible for producing coinage for the United States to conduct its trade and commerce, as well as controlling the movement of bullion. It does not produce paper money; that responsibility belongs to the Bureau of Engraving and Printing. The first United States Mint was created in Philadelphia in 1792, and soon joined by other centers, whose coins were identified by their own mint marks. There are currently four active coin-producing mints: Philadelphia, Denver, San Francisco, and West Point.
The dime, in United States usage, is a ten-cent coin, one tenth of a United States dollar, labeled formally as "one dime". The denomination was first authorized by the Coinage Act of 1792. The dime is the smallest in diameter and is the thinnest of all U.S. coins currently minted for circulation, being 0.705 inches in diameter and 0.053 in (1.35 mm) in thickness. The obverse of the current dime depicts the profile of President Franklin D. Roosevelt and the reverse boasts an olive branch, a torch, and an oak branch, from left to right respectively. As of 2011, the dime coin cost 5.65 cents to produce.
The half dime, or half disme, was a silver coin, valued at five cents, formerly minted in the United States.
The Canadian five-cent coin, commonly called a nickel, is a coin worth five cents or one-twentieth of a Canadian dollar. It was patterned on the corresponding coin in the neighbouring United States. It became the smallest-valued coin in the currency upon the discontinuation of the penny in 2013. Due to inflation, the purchasing power of the nickel continues to drop and currently the coin represents less than 0.5% of the country's lowest minimum hourly wage.
The fifty-cent piece is the common name of the Canadian coin worth 50 cents. The coin's reverse depicts the coat of arms of Canada. At the opening ceremonies for the Ottawa branch of the Royal Mint, held on January 2, 1908, Governor General Earl Grey struck the Dominion of Canada's first domestically produced coin. It was a silver fifty-cent piece bearing the effigy of King Edward VII.
The American twenty-cent piece is a coin struck from 1875 to 1878, but only for collectors in the final two years. Proposed by Nevada Senator John P. Jones, it proved a failure due to confusion with the quarter, to which it was close in both size and value.
A pattern coin is a coin which has not been approved for release, but produced to evaluate a proposed coin design. They are often off-metal strike, to proof standard or piedforts. Many coin collectors collect and study pattern coins because of their historical importance. Many of the world's most valuable coins are pattern coins; nearly 25 of the pieces listed in 100 Greatest US Coins are pattern coins.
The Seated Liberty dollar was a dollar coin struck by the United States Mint from 1840 to 1873 and designed by its chief engraver, Christian Gobrecht. It was the last silver coin of that denomination to be struck before passage of the Coinage Act of 1873, which temporarily ended production of the silver dollar for American commerce. The coin's obverse is based on that of the Gobrecht dollar, which had been minted experimentally from 1836 to 1839. However, the soaring eagle used on the reverse of the Gobrecht dollar was not used; instead, the United States Mint (Mint) used a heraldic eagle, based on a design by late Mint Chief Engraver John Reich first utilized on coins in 1807.
The Kennedy half dollar, first minted in 1964, is a fifty-cent coin currently issued by the United States Mint. Intended as a memorial to the assassinated 35th president of the United States John F. Kennedy, it was authorized by Congress just over a month after his death. Use of existing works by Mint sculptors Gilroy Roberts and Frank Gasparro allowed dies to be prepared quickly, and striking of the new coins began in January 1964.
The 1913 Liberty Head nickel is an American five-cent piece which was produced in extremely limited quantities unauthorized by the United States Mint, making it one of the best-known and most coveted rarities in American numismatics. In 1972, one specimen of the five cent coin became the first coin to sell for over US$100,000; in 1996, another specimen became the first to sell for over US$1 million. A specimen was sold for US$3 million in a 2004 private sale, then resold for US$3.7 million at a public auction in 2010.
The Silver center cent is an American pattern coin produced by the United States Mint in 1792. As a precursor to the large cent it was one of the first coins of the United States and an early example of a bimetallic coin. Only 12 original examples are known to exist, of which one is located in the National Numismatic Collection at the Smithsonian Institution. Two more specimens exist but contain fabricated plugs added after minting.
The Sheldon Coin Grading Scale is a 70-point coin grading scale used in the numismatic assessment of a coin's quality. The American Numismatic Association based its Official ANA Grading Standards in large part on the Sheldon scale. The scale was created by William Herbert Sheldon.
Rare Coin Wholesalers is a rare-coin company that specializes in United States rare coins. Located in Irvine, California, Rare Coin Wholesalers buys, sells, appraises and trades rare coins and precious metals. Originally established as a S.L. Contursi company in 1990, the owners have bought and sold over two billion dollars' worth of rare coins.
John Adam Eckfeldt was a worker and official in the early days of the United States Mint. A lifelong Philadelphian, Eckfeldt served as the second chief coiner of the Mint, from 1814 until 1839.
The Turban Head eagle, also known as the Capped Bust eagle, was a ten-dollar gold piece, or eagle, struck by the United States Mint from 1795 to 1804. The piece was designed by Robert Scot, and was the first in the eagle series, which continued until the Mint ceased striking gold coins for circulation in 1933. The common name is a misnomer; Liberty does not wear a turban but a cap, believed by some to be a pileus or Phrygian cap : her hair twisting around the headgear makes it resemble a turban.
The numismatic history of the United States began with Colonial coins such as the pine tree shilling and paper money; most notably the foreign but widely accepted Spanish piece of eight, ultimately descended from the Joachimsthaler and the direct ancestor of the U.S. Dollar.
The three-cent silver, also known as the three-cent piece in silver or trime, was struck by the Mint of the United States for circulation from 1851 to 1872, and as a proof coin in 1873. Designed by the Mint's chief engraver, James B. Longacre, it circulated well while other silver coinage was being hoarded and melted, but once that problem was addressed, became less used. It was abolished by Congress with the Coinage Act of 1873.
Flowing Hair coinage was issued in the United States between 1793 and 1795. The design was used for the first half dime, half dollar, dollar, and the first two large cents.
The 1804 dollar or Bowed Liberty Dollar was a dollar coin struck by the Mint of the United States, of which fifteen specimens are currently known to exist. Though dated 1804, none were struck in that year; all were minted in the 1830s or later. They were first created for use in special proof coin sets used as diplomatic gifts during Edmund Roberts' trips to Siam and Muscat.
The legend part of the story has it that George Washington personally donated tableware to be melted for the silver, and in return received these pieces to give as gifts to VIPs. Another bit of folklore is that the image is of Martha Washington, which does not square at all with reality (for example, a contemporary portrait of Martha Washington, an image of which is in our research file, looks nothing at all like the portrait on the half disme).