World Most Expensive Coin, Double Eagle - (born Double Eagle) - U.S. gold coins in denominations of $ 20, which were minted from 1849 to 1933. They have several varieties. Double Eagle 1933 is the most expensive coin in the world. A prerequisite for the appearance of a 20-dollar gold coin was the discovery of new gold deposits in California and due to this "gold rush". Engraver James Longekrom has developed the design of two new coins - the golden dollar and 20 dollars. The image on the obverse of these coins are similar.