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en.wikipedia.org/wiki/Mint-made_errors

Mint-made errors are errors in a coin made by the mint during the minting process. Groups of ... Mint error coins can be the result of deterioration of the minting equipment, ... The planchet, die, and striking (or PDS) classification system happens to correspond with the mintmarks of the three largest U. S. mints, Philadelphia, ...

en.wikipedia.org/wiki/US_Error_Coins

There are three categories of error coins as provided by the American Numismatic Association. Metal usage and striking errors referred to widely as “ planchet ...

www.pcgs.com/top100/details.aspx

The modern coin era began in America in 1965, the first year the U.S. Mint produced copper-nickel 'clad' coins as replacement for silver coins, ending an unbroken, 173 year tradition. ... Super-scarce production error. Check your Proof Sets.

www.usacoinbook.com/coins/errors

530 items ... The coin prices and values for Errors. Also showing coins for sale in our database for the Die Errors type Errors items.

www.collectorsweekly.com/us-coins/errors

Shop for-and learn about-US Error Coins. Generally speaking, there are two extremes in U.S. coin collecting. The first is to search for that Holy Grail coin...

coinauctionshelp.com/page14.html

US Mint Error coins images. Mint error coin images, values, facts, identification. US coins with mistakes. The coin minting process, overlay images of every US ...

www.coinnews.net/tools/error-coin-price-guide-with-mint-error-photo-descriptions

... is a coin that was manufactured incorrectly by a mint. Many times called mint errors, error coins come in scores of "shapes, sizes and types. ... U.S. Gold Errors  ...

www.bellevuerarecoins.com/mistakes-pay-big-valuable-error-coins

Apr 28, 2014 ... When these doubled-die error coins were first discovered, the Secret Service confiscated them. After the coins were confiscated, the U.S. mint ...

www.thespruce.com/most-valuable-coins-in-pocket-change-768897

Jul 8, 2017 ... You may have some coins worth money sitting in your pocket right now. There are a number of fairly valuable U.S. error coins and die varieties ...