I have 2005 dime that is brown with a few black marks threw it, it's not dirty and doesn't seem like normal aging at least not the type of aging I'm use to seeing in coins but I have doubts do to the fact I cant find anything at all online about it...hopefully you guys can help If you need them I can try to get a better picture
Yes to Environmental Damage.. Not a Mint Error Clad coins get affected by dirt, sand, soil Here are my Metal Detected finds -
