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Has anyone ever seen one of these, I can't locate anything like it, I was initially told it might be chromium in matrix, I actually live in one of the richest mineral and gemstone heavy area's of the US, so I don't have to buy. But have lots to sell,...

Hi, I need abit of advice. I have a few error coins, not sure what they are worth, but I need to know where I'm supposed to get them graded. Or if it's even worth getting them graded. One of them specifically is a 1981 D lincoln penny, it has tons of...