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Manufacture of Proof Coins
Proof coins are struck twice using dies that have been polished and chemically treated. The metal blanks are also polished and inspected before being struck. They are produced annually as collectibles by the U.S. Mint at a price that exceeds their face value.
History of Proof Coins
The Mint began producing proof coins in 1908 and continued until 1916. It picked up the process again in 1936, when it began producing annual proof sets, which included one coin of each denomination.
Types of Proof Coins
Regular proof coins differ from "cameo" proof coins in that cameos have details with a white or "frosted" appearance. A "deep cameo" has a field that can appear almost black. Cameos are usually the result of the first few strikes of brand new dies.
Proof Sets
The U.S. Mint currently issues annual proof sets containing one coin of each denomination. In some years the sets may also include commemorative coins. These may be purchased directly from the U.S. Mint.
Proof Coin Packaging
The U.S. Mint currently issues proof coins in hard plastic containers to protect the coins. In past years proof sets were issued in plastic sleeves with a separate "pocket" for each coin. A collector should never open the packaging of a proof coin, as this will decrease its value.