what are the most sought after coins?
['1899 Single 9 Pond (South Africa) ... ', '1804 Draped Bust Dollar (U.S.) ... ', '1913 Liberty Head Nickel (U.S.) ... ', '1794 Flowing Hair Silver Dollar (U.S.) ... ', '1787 Brasher Doubloon, EB Punch on Wing (U.S.) ... ', '723 Umayyad Gold Dinar (Islamic Umayyad Kingdom) ... ', '1933 Saint-Gaudens Double Eagle (U.S.) ... ', '1794 Flowing Hair Silver Dollar (U.S.)']