An extremely rare half-dollar coin from 1838, now valued at as much as $500,000, is set for auction this week. The 1838-O Capped Bust half dollar is one of only nine that are known to exist, according ...

An American silver coin dating back to the 17th century, before the United States was founded, has sold for a record-breaking $2.52 million at auction, eight years after it was discovered in an old ...