The coin sold for $506,250 in an online auction that concluded Sunday, according to Ian Russell, president of GreatCollections, an auction house based in Irvine, California. The only other known ...
In 1975, the U.S. Mint in San Francisco produced 2.8 million proof sets — coins for collectors, not for circulation — marked with an “S.” But at least two of these coins lacked the “S ...