World's Most Expensive Coin

Nearly half a million of the U.S. 'Double Eagle' gold twenty dollar coins were originally minted during the Great Depression, but now only 13 are known to be in existence today. In 2002 a Double Eagle sold at auction for $7.6 million.

A 'Double Eagle' gold twenty dollar coin is displayed above a catalogue picture showing the reverse side of the coin at Goldsmith's Hall on March 2, 2012 in London, England. 

Peter Swanston of the London Mint Office holds a 'Double Eagle' gold twenty dollar coin

Front view of U.S. 'Double Eagle' gold twenty dollar coin

Rare view of U.S. 'Double Eagle' gold twenty dollar coin