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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…

Weak strike In the production of coins, a strong pressure of 35 to 200 tons is required for the upper die to transfer the design elements onto the planchet. The pressure required varies according to the denomination of the coin, the alloy used for production, and whether it is intended for circulation or testing purposes.…

Struck through planchet Struck through planchets is a type of coin error that occurs when two planchets are mistakenly fed into the beating chamber at the same time while the press is in operation. The overlap can be total or partial, and the affected area always presents a difference in height, resulting in a classic…

Struck through coin – Brockage The coin error known as “Struck Through Coin – Brockage” occurs when a newly minted coin remains attached to the upper or lower die during the striking phase. This results in another planchet being introduced into the beating chamber, which is then struck together with the previously trapped coin. In…