wear

摩耗　—　Measuring

The slow loss of metal as a coin passes from hand to hand.

Sestertius of Hadrian117–138 Crown of William III1696 Bank of Chosen One Yen Note1932

A worn coin does not contain the amount of metal corresponding to its face value. If it still circulates at face value, the difference becomes someone's loss.

⚠ The weight of an excavated coin should not be taken as its official standard at the time of issue. It is lighter due to wear.