Author Archives: Ken Potter

The black-eyed Grant dollar coin mystery is solved. Reader Richard Stachowski sent in images of a 2011-P Ulysses S. Grant dollar for the June 21 issue of Numismatic News that presented us with a mystery that I thought might be a good-sized die break, or maybe die clash marks below Grant’s right eye. Continue reading →

This article was originally printed in Numismatic News.  >> Subscribe today! Perhaps the most interesting coins to turn up at my table at the spring Michigan State Numismatic Society convention besides the proof 1962 half dollar I reported in the … Continue reading →

A fourth specimen of the elusive 1992 Philadelphia Lincoln cent struck with a “Close AM” (of AMERICA) design style reverse has been reported to this author.
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If you happened to buy a proof 2007-W half-ounce platinum American Eagle, now is the time to dig it out and see if it exhibits a die polishing error as the quarter-ounce and ounce coins do. Continue reading →

A tripled-die 1892-CC $10 gold piece has been identified by Numismatic Guaranty Corp. Continue reading →

David S. Brenner of Delaware found what appeared to be a bona fide strong doubled die on a 2010 Grand Canyon 5-ounce silver bullion coin showing in images he sent to Numismatic News.  It wasn’t. Continue reading →

In recently discussed many ways to collect errors and varieties, one of which being an assemblage of one of each error-variety type that is possible within a series. I’d like to show more of the types that a collector might want to add to his or her collection. Continue reading →

A James Buchanan Presidential dollar has been found with a plain edge. So far, it is the only one reported. Continue reading →

More extra rays in Liberty’s crown have been found on Presidential dollar coins. Continue reading →