Coin Glossary

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

Coin Glossary

U

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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Coin Collecting News
07/11/2025
10 Years After Cheyenne Coin Shop Double Murder, Trial To Begin
Trial begins with jury selection Monday a decade after the brutal July 20, 2015, murder of two men at The Coin Shop in the downtown district of ... more info

07/11/2025
Dollar coin that debuted earlier this year celebrates Michigan's auto history
A new $1 coin for Michigan as part of the U.S. Mint's Innovation Dollar series celebrates the auto assembly in the state. more info

07/08/2025
Michigan coin dealer who gambled $5.1M at casino sentenced for stealing from customers, owes $433K
Former Flying Eagle Coins owner Matthew J. Burton received 23 months to 10 years in prison and must pay $433,500 in restitution to nine victims across Michigan. more info