What do we mean by proof or uncirculated? Find below some common terminology used with collecting coins

Authentication - Authoritative determination of the genuineness of a coin.

Circulating Coin - A coin that has been issued by a bank.

Grade - A carefully constructed series of guidelines to determine the condition and therefore the rarity and value of a coin.

Mint mark - A letter or symbol, indicating the mint of origin.

Mule - A coin, token or medal whose obverse design is not matched with its reverse.

Numismatics - The science, study or collecting of coins or similar objects.

Proof Coin - A carefully struck coin using special dies, with frosted images on a mirror-like background. Proof is a method of manufacture, not a condition or grade.

Uncirculated Coin - A coin which has not been distributed or used as currency.