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Proof Sets

Frequently Asked Questions about Proof Sets     (Answers provided by usmint.gov)

What is a "proof coin"?     Proof coins have represent the highest level of the craft. The term "proof" really refers to the manufacturing process by which the coin is made.

What is so special about the way that proof coin sets are manufactured and handled?  The method for making a proof coin starts out as it does for any other coin: A United States Mint sculptor-engraver begins by sculpting a three dimensional image of the coin design into plaster. The plaster cast is taken through a series of processes resulting in a steel die.  From this point on, the procedure differs from the process used to manufacture coins for general circulation. With proof coins we give the dies a special finish. A distinct feature of our proof coins is the two-tone surface consisting of a lightly frosted image against a shiny, mirror-like background. This effect is accomplished by a unique method of sandblasting and polishing different areas of the dies that are used to strike proof coins. 

Proof coins are also famous for the raised detail of the image. We achieve that raised detail by striking a highly burnished die, not once but at least two times, in a lower speed coin press. The coins are then packed in acrylic cases to showcase and preserve their exceptional finish.

Is only a limited number of annual proof sets made each year?  Yes. Each year, the United States Mint manufactures and sells a limited number of annual proof sets.  For example, approximately 2.450 million of the 2002 United States Mint Proof Sets will be sold by the United States Mint.

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