Commemorative coins can be seen as being of one of three types:   1. Regular issue coinage are the normal coins intended to be used in commerce every day and are typically issued with the same design for several years.   2. Circulating Commemoratives are intended to be used for commerce, but the design will only be issued for a limited time to commemorate an event, anniversary, person or location, among other items.   3. Non-circulating legal tender (NCLT) are coins which are legal tender, and thus can in theory be used to purchase goods or services, but are not intended to be used in such a manner. Rather, they are intended as collector's items with numismatic value, and are often produced in gold or silver, either in uncirculated condition or with a proof finish.