When coins were made of precious metal ‘milling’ help reduce the practice of ‘clipping’ metal off the coins.
Given that current US coins are made of relatively inexpensive metals, as opposed to gold and silver, does the ongoing milling serve any purpose?
I thought it might be ‘tradition’ but then wondered if there was some practical aspect, such as in vending machines or coin-counting machines. Or maybe there’s some out-of-date law on the books.
I note that pennies and nickels don’t have milling while dimes and quarters do. (I don’t have a half- or dollar coin handy just now)
Anywhow - why do they keep doing it?