The 1851 Gold Liberty One $1 Dollar Coin is a piece of historical significance from the United States, minted in Philadelphia with a composition of 0.900 fineness gold. This business strike coin is circulated and ungraded, making it a valuable addition to any coin collection.  Gross Gold Weight 1.672 grams, purity is 90%. Actual gold weight (AGW) 0.04837 troy oz.