10 Rarest and Most Valuable Coins in the World 

1849 Double Eagle ($20 Gold Piece)

1933 Double Eagle

Brasher Doubloon (1787)

Flowing Hair Silver Dollar (1794-1795)

1804 Silver Dollar

Liberty Head Nickel (1913)

1804 Eagle ($10 Gold Piece)

1937 Edward VIII Proof Crown

1894-S Barber Dime

1796 Half Dime