Coin Glossary

You can find most popular coin collecting phrases in this coin glossary.

Coin Glossary


unc or unk or UN - abbreviation for uncirculated.

uncirculated or un-circulated - a new condition coin that does not have any sign of wear. Marks on the coin that may come from the manufacturing process do not keep a coin from being un-circulated. (Example, bag marks.) Even the slightest amount of wear or cleaning will keep a coin from grading uncirculated.

upsetting mill - machine used in coin production to raise the rim on both sides of a blank (planchet).

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