Definition: Term for the wavy finish seen on the surfaces of most close-collar Proof coins.
Definition: Refers to a coin that does not show its intended detail because of low striking pressure or improperly aligned dies.
Definition: Visible erosion of metal, usually beginning from the highest points of a coins. Eventually, lettering, details, or entire devices are obliterated. Wear should not be confused with a weak strike. It is possible for a worn coin to have more detail than a weakly struck mint state coin.
Definition: Synonym for “counting machine mark.”
Definition: An artificial process whereby the surface of a coin is buffed to give it the appearance of having natural cartwheel lustre.
Definition: An effect whereby a thin, wire-like section of the rim of a coin is raised above the rest of the rim along the outside. This effect is typically caused by very high striking pressure, and tends to occur mostly on proof and high relief strikings.
Definition: A die created from a working hub that is used to strike coins.
Definition: A hub created from a master die that is used to create the working dies.
Definition: A die that has lost detail due to extended use. Dies were often used until they wore out, or were excessively cracked or broken. Coins struck from worn dies often appear to be weakly struck, however, they are not caused by low striking pressure.
Definition: Abbreviation for Extremely Fine.