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In addition, errors are often not noted by grading services. Overdates, mules, brockage, double denomination, and struck on the wrong planchet errors are often valuable. Errors on ancient, medieval, and higher-value coins, however, may be detrimental to the coin's numismatic value.
Estimated value: Between $250,000 and $2 million The 1974 Aluminum Lincoln Cent is an elusive and highly valuable coin, notable for its unique composition. In 1974, the U.S. Mint experimented with ...
Improper alloy mixtures occur when the sheet stock contains uneven layers of the metals intended for the type of coin that is produced. A result of improper layers of metals is a coin produced without an intended surface layer of nickel. A dime or quarter without the nickel layer will contain only the copper alloy mixture.
The planchet is therefore struck at room temperature, and the only thing which makes the coin form is the tremendous pressure used to strike it. With a metal such as nickel, which is harder than a normal coin metal like silver, gold or copper, the pressure must be greater. When a nickel coin, or any coin, is struck, the metal must "flow" into ...
Along with its sister publication, the older Handbook of United States Coins (The Official Blue Book), it is considered an authoritative U.S. coin price guide. The Guide Book and Handbook got their nicknames (and now official trademarks), the "Red Book" and the "Blue Book," due to their respective solid red and blue covers. [1]
Seven distinct types of coin composition have been used over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum and palladium. The base metal coins were generally alloys of copper (for 2 cent coins and lower), and copper/nickel (for 3 and 5 cent coins). Copper/nickel composition is also used for ...
Pre-1992 British pennies were made of 97% copper; but as of 2008, based on the price of copper, the value of a penny from this period is 1.5 new-pence. Modern British pennies are now made of copper-plated steel. Cupronickel, a base metal alloy with varying proportions of copper and nickel, was introduced as a cheaper alternative for silver in ...
This made the new coin heavy, in terms of weight per $.01 of face value, compared to the three-cent copper-nickel coin. The bill passed without debate on May 16, 1866. [ 16 ] The new copper-nickel coin was legal tender for up to one dollar and would be paid out by the Treasury in exchange for coin of the United States, excluding the half cent ...