Glossary

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on U.S. Planchets

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Two-Headed Coins
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Uncanceled Dies
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Uniface Die Trials
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Unique Coins


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Spectacular Errors

A spectacular error can be anything. Many factors have to come together for an error to be truly spectacular.

This unique 1970-S Proof Quarter from the United States was over-struck on a 1941 Quarter from Canada. This mint error was originally discovered in a group of San Francisco Proof Errors that was auctioned by the State of California. There is a significant amount of detail on both sides showing the design of the Canadian Quarter. This is one of the most fascinating and intriguing proof mint errors ever discovered.

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