Definition:A commemorative coin, U.S. collection of coins, it is usually intended to be a special not circulating coins issued by the Mint of the United States and that are sold to collectors at prices substantially above the nominal value and supplements that support a program linked to the theme of the coin, which include. For example, part of the purchase price of commemorative coins-zecca vecchia di San Francisco went to finance the establishment of a Museum of building S.F. della zecca vecchia.
In a broader sense, especially in non-US currencies, a commemorative coin is a coin in circulation which commemorates a certain person, place or event. Commemorative are usually only issued for one year, although sometimes are extended and are characterized by the fact that depart from coins "normal" or adjust the problem.
Commemorative coins sometimes end up becoming regular coins, as in the case of US Lincoln Cent and district of Washington. Both currencies, when the first issue, had to be one year circulating commemorative, but the public liked it so much that the Mint continued issuing them them.
