Bringing the latest mint error news to the collector. Also featuring Die Trials, Patterns, Test Pieces, Numismatic Rarities, Currency Errors and Discoveries from the U.S. Mint.
Proof coins are struck by technicians who hand feed the blanks into special presses. They are produced, examined, and packaged using extreme quality control. It is very unusual to find major proof errors. A few broadstrikes, off-centers, double strikes (in collar) and off-metals have been known to be found in sealed proof sets. Proof errors are aggressively sought after by many error collectors.