An unstruck planchet is a blank coin that has not been struck by a die, resulting in a coin that has no design or markings. This type of error can occur during the manufacturing process when a planchet is not properly fed into the coin press or when a planchet is not struck with enough force to leave an impression. Unstruck planchet errors can also occur when a foreign object, such as a piece of debris, becomes lodged in the coin press and prevents a planchet from being struck properly.