The GreatCollections Coin and Paper Money Glossary
This is a popular resource that explains hundreds of coin related terms, as well as terms relating to our coin auctions. Of course, if you have questions about anything, please do not hesitate to contact us.
Altered Surface
An "Altered Surface" on a coin refers to any modification made to its original surface post-minting, such as polishing, cleaning, or chemical treatment, which can negatively impact its numismatic value and authenticity.
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