Obverse

The front side of a coin. Usually the obverse side of a coin has the main design, date (year of issue), and sometimes a mintmark. Sometimes called the "heads" side of a coin because many coins have a person's portrait or head design on the obverse. The back of the coin is called the reverse.

Precious metal

Metals of value. Typically gold, silver, platinum. However, can include palladium and rhodium.

Proof

A coin produced from polished dies. Most often each proof coin is struck twice or more which gives the coin a very sharp degree of detail and mirror like surface. Most proof coins have a highly polished mirror finish background contrasted against a matt finish on the raised parts of the design.

Proof set

A group of limited edition proof coins in different denominations made for one year packaged and certified as a set in a leatherette box.

Prestige set

A group of limited edition proof coins in different denominations made for one year packaged and certified as a set in a wooden presentation box.