The “King of U.S. Coins”
The 1804 dollar is among the most coveted of all rare U.S. coins, with only 15 known examples. Strangely enough, no dollars dated 1804 actually were struck in that year. The United States Mint prepared dollars dated 1803 in 1804, and then stopped regular production of silver dollars until 1840.
Read the full article here… http://www.money.org/Exhibits/1804Dollar/