The Coinage Act in 1792 established the dollar as the basic monetary unit for the U.S. basing the independent system on the world price of gold at that time - $19.39 (Troy ounce). The Act of March 3, 1849 authorized the coinage of gold dollars with the weight being set at 25.8 grains; and a finenesss of .900.
In April of 1792 quarter eagles were authorized and weighted in at 67.5 grains; and a fineness of .9167. This was changed in June of 1834 when the weight was decreased to 64.5 grains; and fineness reduced to .8992. In January of 1837 the fineness was increased to .900. While most coins prior to 1855 are rare, one would deem these coins more desireable for their numismatic value than for their 'gold' content.
There were several variations of the quarter eagles produced. The early versions include the following:
• Capped Bust (looking to right) 1796-1807
• Capped Bust (looking to left) Large size, 1808
• Capped Head (looking to left), 1821-1834
• Capped Head (looking to left), Reduced Diameter, 1829-1834
• Classic Head, No Motto on Reverse, 1834-1839