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Struck through fragment The struck through fragment is a type of coin error that occurs when a metal fragment becomes trapped in the beating chamber along with the newly inserted planchet and is subsequently struck by dies at the same time. The fragment then detaches from the newly minted coin, leaving behind a cavity with…

Struck through lubrificant Struck through lubricant is the most common type of minting error and occurs when lubricant from the machinery used for coin production greases the planchet or dies during the minting process. This error is generally evanescent and can partially or completely erase the design depending on the amount of lubricant that takes…

Struck through errors When producing coins, the minting process involves complex machinery and equipment that could break and lead to foreign objects finding their way into the beating chamber. These foreign objects can range from solids to liquids, such as grease, bolts, plastic, planchets, coins, fragments of other minted coins, and more. When a foreign…

Die break Rim die break – Cud The rim die break, also known as a cud, is a type of coin error that occurs only on the edge of the coin. It is essential to note that the gutter, which constitutes the edge and is the most engraved part of the die, is the weakest…

Lamination Errors Lamination errors are a type of coin error that occurs when foreign bodies or impurities, such as metal dust, slag, debris, and so on, are trapped inside the melted metal used to produce new planchets. These foreign bodies become a part of the planchets and subsequently the coins produced from them. If foreign…

Die Clash In modern currency presses, it is imperative to adjust the minimum distance between the two dies to prevent collisions, even in the absence of a planchet. Nonetheless, incorrect adjustments or malfunctions can reduce the minimum distance to zero, which may result in die collisions if a planchet is not fed into the ferrule…

Canceled coins and dies Canceled coins are a type of coin error that represents real production waste from the mint. The term “production waste” encompasses all coins that are minted regularly and produced in excessive numbers or entire batches of coins that have been defective and rejected by quality control. Minting errors are almost always…

Die alignment errors Die alignment errors are a type of coin error that can occur due to incorrect orientation of the dies during the coin minting process. It’s important to note that the orientation of the two sides of a coin is not predetermined by the issue decree issued by the Ministry of the Treasury,…

Edge errors There are various techniques used to emboss the design elements on the edge of a coin. One method involves using a machine called a straight edger during the hemming process, which both defines the effective diameter of the planchet and coins the edge. Another technique involves performing this operation simultaneously with the minting…

Wrong die or mule The coin error type of Wrong die or mule is a striking error that is commonly caused by an incorrect installation of the dies on the money press. This error occurs when a worker installs a pair of mismatched dies and activates the monetary press, resulting in the production of the…