The standard gold coin of the United States of the value of ten dollars. They were authorized to be coined by an Act of Congress dated April 2, 1792, and were to have a fineness of .916 2 / 8 and a weight of 270 grains. They were issued from 1795 to 1804 with the exception of 1802. In 1838 a new design appeared, engraved by William Kneass, and of a fineness of .900, as provided by an Act 'of Congress dated January 18, 1837. This issue continued until the year 1907 when it was succeeded by the new design of Augustus St. Gaudens. There are also double, half, and quarter Eagles.
Source: Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)