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 object is inserted into the beating chamber during the minting process, it can result in a Struck Trough Object error.

In such cases, the object will be minted onto the planchet, and its shape will be visible in the incuse compromised area, as well as the imprint of the dies. If the object remains attached to the coin after minting, it will fill the space that would otherwise be left blank. The identification of the object minted together with the coin is crucial in determining the coin’s rarity and value. In most cases, identification is simple, but it can be challenging due to the object’s distortion caused by the monetary press’s strong pressure.

When the object involved cannot be determined, the coin falls under the generic category of “Struck Trough Foreign Object,” indicating that the coin was minted through an unknown foreign object. The value and rarity of the coin increase in proportion to the size of the area involved, as with all types of minting errors.