I am a newbie to CT and collecting(Grandson fun). We have seen a lot of coins with these grooves in circular pattern. Can someone help us determine if they are very common errors or PMD? They are very consistent, some have 2 or 3 rings from the center out.
+3 .. coin roller crimper which was done sometime, and maybe way past the time it was minted. Once it is minted and falls out of the minting machine it is no longer considered any form of minting error. At that point everything is PMD - Post Mint Damage whether this was done at a bank or last week at someone's basement rolling machine.
