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Die errors are caused by the mint dies wearing down over time or dies that have not been prepared identical to others that have been replaced. The result of preparing a set of new dies improperly from the original hub results in coin errors such as doubling, extra details, or missing details on the surface of the coin.
A uni-face coin results when two planchets are stacked one atop the other at the time of striking. This produces two coins: one with only an obverse image, and a second with only the reverse image. The planchets may be centered over the die producing one complete image on each coin or off-centered producing partial images on each side.
However, it too wears the dies when they are used for too long. An infamous example is the 1955 "poorman’s double die." This coin is sold as a replacement for the 1955 doubled die cent, but it is no more than Die Deterioration Doubling, caused by wear on the dies. When a coin is struck, the planchet is not heated. Although the planchet would ...
If you've ever run across a blank coin, chances are you thought a metal token got mixed in with your change by mistake. In fact, blank coins are not uncommon due to errors during the minting ...
But before tossing your Lincoln pennies into a coin jar that will one day be dumped into a Coinstar machine, take the time to look at them — even those minted between 2009 and 2023. Find Out ...
The following mint marks indicate which mint the coin was made at (parentheses indicate a lack of a mint mark): ... Error, many counterfeits exist 1923 (P) 74,723,000 ...