It cannot be repeated enough how important it is for an authenticator to know what genuine coins look like in order to make correct determinations about the coins he or she is shown. Coins have dozens of attributes associated with their style, color, fabric, shape and execution, just to name a few. “Mint quality” is the catch-all term we coined to take in all these characteristics as they appear on a genuine coin.
Read entire article: Mint quality difference can be sign of fake - Numismatic News
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