Pattern coin
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A pattern coin is a coin produced for the purpose of evaluating a proposed coin design, but which was not approved for general circulation. They are often off-metal strikes, to proof standard or piedforts. Patterns are collected by many coin collectors, and although some decide to focus upon them alone, they are generally of interest to all coin collectors because of their highly elaborate designs.
They are not to be confused with trials, (which are produced to test the dies), although they are often grouped together. Many countries have restricitons on the sale of recent pattern coins (such as America), as they claim that they should never have left the mint. Such coins (like the 1969 peace dollar) are bought and sold only on the black market.