This does not normally result in doubling that is readily observable, but does result in the devices being struck fully, resulting in intricate elements of the original die being present on the proof that may not be present in such detail on circulation strikes. Most proof coins are double struck under higher pressure. A PR70 coin is the highest grade possible for a proof coin and indicates a perfect example, with PR69 and lower grades reflecting some deficiency in the strike, centering, details, or other aspect of the coin. Certification agencies can grade and assign numerical ratings for proof coins. Proof coinage dies Indian peace medal ( President Hayes ) President Grant John E. The term "proof" refers to the process by which the coins are made and not to the condition of the coin. Proof coins of the early 19th century even appear to be scratched, but it was part of the production process. Several other methods have been used in the past to achieve this effect, including sand blasting the dies, and matte proofs. However, proof does not necessarily indicate the condition of the coins, but rather the way in which the coins are produced or manufactured. The dies for making modern proof coins are often treated with chemicals to make certain parts of the design take on a frosted appearance, with the polished fields taking on a mirror finish. Mint recognizes a proof coin as a specially made coin distinguished by sharpness of detail, usually with a brilliant mirror-like surface. They can usually be distinguished from normal circulation coins by their sharper rims and design, as well as much smoother "fields" – the blank areas not part of the coin's design. Preparation of a proof striking usually involved polishing of the dies. ( January 2022)ĭecorative packaging for proof set: Reserve Bank of New Zealand Royal Mint 1970 British proof set The examples and perspective in this article may not represent a worldwide view of the subject.
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