Heritage Auctions Blog
for Collectors by Collectors
Director of Numismatics, New York
Read this article to find out what causes rainbow toning on coins, and how it effects the value.
March 20, 2014
After first hearing the definition of a “proof” coin, or a specially struck coin with mirrored surfaces produced by the United States Mint for collectors instead of for circulation, it becomes clear that such coins …
February 13, 2014