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2. Mint-made errors - Wikipedia

   en.wikipedia.org/wiki/Mint-made_errors

   Clipped planchet U.S. nickel showing the Blakesley Effect near the word LIBERTY. A misfeed can occur when the metal strip is fed through the blanking machine.

3. US error coins - Wikipedia

   en.wikipedia.org/wiki/US_error_coins

   The over mint mark is created when a one date and mint mark is punched over another date, part of a date, or mint mark. These coins are generally restricted to the early minting process of coins dating before the turn of the century. The DDO and DDR errors are related to any part of the coin that shows a distinct doubling.

4. Brockage - Wikipedia

   en.wikipedia.org/wiki/Brockage

   The use of screw presses drastically reduced the amount of brockages which escaped the mint from the mid 16th-century onwards, but as high speed machinery became more common in the 19th century, more brockages appear. It is known that some unscrupulous mint workers have created brockages in the past simply in order to sell to coin collectors.

5. 5 Most Valuable ‘Error Coins’ Ever Minted — Check for These ...

   www.aol.com/5-most-valuable-error-coins...

   As with just about any asset, a coin's value is determined by its market demand. This means that coins in short supply often see higher demand -- and higher values. With coins, supplies are limited...

6. 12 of the Rarest U.S. Mint Error Coins Worth a Fortune - AOL

   www.aol.com/finance/12-rarest-u-mint-error...

   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 ...

7. Half dollar (United States coin) - Wikipedia

   en.wikipedia.org/wiki/Half_dollar_(United_States...

   The half dollar, sometimes referred to as the half for short or 50-cent piece, is a United States coin worth 50 cents, or one half of a dollar.In both size and weight, it is the largest circulating coin currently minted in the United States, [1] being 1.205 inches (30.61 millimeters) in diameter and 0.085 in (2.16 mm) in thickness, and is twice the weight of the quarter.

8. Die-deterioration doubling - Wikipedia

   en.wikipedia.org/wiki/Die-deterioration_doubling

   In modern presses, a die strikes approximately 120 coins a minute. This is a large number of coins produced in a short time, and obviously the die cannot last forever. However, the process of wearing the die is only hastened by the metals used in coins. Nickel, one of the main metals used in today’s coins, is quite hard and causes wear ...

9. Australian fifty-cent coin - Wikipedia

   en.wikipedia.org/wiki/Australian_fifty-cent_coin

   The 1986, 1987, 1989, 1990, 1992, year dated 50¢ are only available in mint and proof sets, with the exception of the 1967 and 1968, as no mint/proof sets exist for those years and there were no circulation strikes produced either. Fifty-cent coins are legal tender for amounts not exceeding $5 for any payment of a debt. [7]