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Coins minted with a die break have a thin line or lines that are raised running across the surface of the coin. Below is a photograph of a 1954-S Jefferson nickel with a die crack along the top of the portrait of Jefferson.
Coins struck after the break falls away have a raised, rounded, unstruck area along the edge. These coins are known to collectors as cuds. Sometimes, an area of a die will chip out of the center.
Most U.S. coins are minted for circulation or as collector coins at three production facilities: Denver, Philadelphia and San Francisco (the West Point mint ceased making coins in 2021).
Two dies are used for striking a coin, one for the front — the obverse or “head’s” side — design of the coin and the other for the back — the reverse or “tail’s” side — of the ...
Some coins, such as United States quarters and dimes, have reeded edges. Reeding of edges was introduced to prevent coin clipping and counterfeiting. [2] [3] The main techniques of coin edging are edge mills of various types, which put a pattern on a smooth edge, after a coin and coin mills with edge rings, which pattern the edge at the time ...
Brockages are relatively rare among modern coins of industrialised countries where mints exercise a strict production control and somewhat less rare among the modern coins of some developing countries which operate their own mint (e.g. Nepal); in good condition, coins with clear brockage are a collector's item and can sell for substantial ...
In modern practice in the United States, milling, or a milled edge, can refer to the raised edge on the coin face, applied by a special milling machine after the planchets are cut out and polished. In addition, the reeding of coins of higher value, applied by the collar holding the coin when it is stamped, can be considered part of the milled edge.
A die crack occurs when a die, after being subjected to immense pressure during the minting process, cracks, causing a small gap in the die. [3] If this damaged die continues to produce coins, the metal will fill into the crack, thus revealing a raised line of metal in the finished coin.
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