They was a problem for several (in the 80s) years until they figured out the problem with them. There was an issue with zinc dust on the planchets that were getting plated on the coins making a rough surface. But since they figured out a better way to rinse them before plating, they have been a whole lot better.
Depending on what it is struck through. Struck Through Grease are easy to find. But struck through other things are more in demand. Struck through wire. Struck through rim bur.
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