If you have a car, there are so many terms that would explain what you have. Same with a coin when you say it has an error. That is as vague as say you have a car. People misuse terms. A coin that is damaged is now a face value coin. If you have a coin that is a die event, it is common coin. All the dies go through a certain exact process a million times. If you have a mint error, they are usually a one time event. Wrong planchet error, double struck, off center, struck through debris, planchet error and on and on. These are one time happenings. A die event could happen as much as 1/2 a million times, from just one die pair. (making them a common event) If you have a die all the coins struck by that die will have the same die variety. So to come in and say you have an error, what is it? Always good to know.