Although military coins are made of metal materials, they have a certain degree of hardness and seem to be hard to damage. Keeping coins is not easy. The quality of the coin is divided into 70 grades according to the American standard. The correct preservation method should slow down or stop the corrosion process of the coin, avoid being damaged, and try to maintain the original quality grade. So why are military coins improperly stored? The following is a detailed introduction.
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