Counterfeit coins are very interesting. There are all types of counterfeit coins. There are also a myriad of ways how to
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NGC Counterfeit Detection, Identify Counterfeit Coins
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NGC Counterfeit Detection, Identify Counterfeit Coins
NGC Counterfeit Detection, Identify Counterfeit Coins
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Two counterfeit coins in counterfeit PCGS holders.
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Counterfeit British £2 coin (left) compared to genuine (right