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Grading U.S. Proof Coins
proof american eagle platinum coinBy Arlyn G. Sieber
February 22, 2010
proof american eagle platinum coin

Because proof coins are struck by a special process using polished blanks, they receive their own grading designation. A coin does not start out being a proof and then become mint state if it becomes worn. Once a proof coin, always a proof coin.

In the ANA system, proof grades use the same numbers as circulated and uncirculated grades, and the amount of wear on the coin corresponds to those grades. But the number is preceded by the word “proof.” For example, Proof-65, Proof-55, Proof-45, and so on. In addition, the ANA says a proof coin with many marks, scratches or other defects should be called an “impaired proof.”

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