Proof Editions: The term "Proof" refers to a method of manufacture which produces a superior quality coin. Proofs are struck on specially prepared planchets using highly polished dies. They are struck multiple times at low speed and are made expressly for collectors. Modern Proof coins are easily identified by their mirror-like finish and frostedfeatures. The modern commemorative issues above are specially package by the U.S.Mint to preserve their brilliant appearance.