On May 4, Heritage Auctions will offer in its mineral auction “The Lightning Bolt” – a nearly 10-inch-high formation of gold weighing 22.66 troy ounces.

The 30th U.S. president, Calvin Coolidge, honored by the U.S. Mint on new Presidential dollar coin cover, was in office during the Roaring Twenties.

James Moores presided over his last Central States Numismatic Society session during the group's meeting in Schaumburg, Ill., in April 2014.

April 28, the United States Mint announced numismatic products in its 2014 Spring Catalog, as well as release dates for upcoming products.

Want to learn about all aspects of the numismatic hobby? A new effort by a Swiss-based museum offers free podcasts through iTunes U.

The practice of issuing commemorative coins picked up in the early to mid-20th century. Three examples sold in Heritage Auctions' sale offered varied results.

Reader responds to April 14 Monday Morning Brief: if silver American Eagle reverse changes, give eagle a strong, bold, stationary posture, not in flight.

ICG grader notes wiping coins with a soft cloth is not a safe way to remove tarnish from rare, expensive, Proof or high-grade coins. Maybe metal-detector finds.

More than 130 U.S. silver commemorative coins dating from 1892 to 1954 sold for $18,000, more than twice the estimate, during a Doyle New York auction.

Details about James Mason Hutchings, likely author of San Francisco Mint tour description referenced in Joel Orosz column in March 24 Coin World.

The Coinage Act of April 2, 1792, established a Mint and the dollar as legal tender. A first printing, signed by Thomas Jefferson, sold for $118,750 on April 8.

A previously unreported 19th century brass hub reduction bearing an eagle design by U.S. Mint Engraver Christian Gobrecht has been authenticated by NGC.

Auction bidders and consignors should do their due diligence and closely read the terms of sale at an auction.

Donald H. Kagin replies to Ute Wartenberg April 14 Coin World Guest Commentary, describes efforts to present, chronicle, preserve gold coin hoard in California.

U.S. Mint officials knew before a Proof 2014-W Baseball gold coin was received by NGC for certification that the piece could not be a missing Mint mark error.

Canceled dies and cancellation dies are entirely different: Here's how these error coins differ from each other.

To keep roll-searching fun, don't just look for Lincoln, Wheat Ears cents. Be open to finding error coins, die varieties and even tokens.

Sales of 2014 National Baseball Hall of Fame silver dollars were sold out within the first two weeks of issue. Sellouts different from program to program.

Some counterfeit gold coins are much easier to spot than others, for a variety of reasons. A purported 1919 gold sovereign is a good example.

The American Numismatic Association is offering “Spousetivities” that will take 2014 Summer Seminar attendees’ companions on day trips in the Denver area.

Jewish-American Hall of Fame medals have long been collector favorites and two celebrate Jewish-American baseball players — Hank Greenberg and Moe Berg.

National Baseball Hall of Fame offiicials lauded the U.S. Mint in executing the Baseball commemorative coin designs and in their development.

To highlight the 50th anniversary of the Kennedy half dollar, the United States Mint has launched a multipart online retrospective.

A Proof 2014-W National Baseball Hall of Fame gold $5 half eagle believed by its owner to be missing the W Mint mark is not missing the Mint mark after all.

A 20-year-old college student from Georgia is the recipient of the Professional Numismatists Guild 2014 Young Numismatist Scholarship.