George Morgan's famous liberty head design, previously believed to have been modeled after Anna Williams. This was also made as an eagle J1581-J1582/P1774-P1775.
About a dozen are known, several of which have been gilted.
These were also struck in gold J1577/P1770 with only two known sa follows:
1) Massamore 11/1884, Steigerwalt 4/1885, Scott 11/1888 (Foster Ely), C.F. Libbie 10/01, Mitchelson, Connecticut State Library.
2) Parmelee, Chapman Brothers, Brand, Judd, Wilkison, Smithsonian
Additional information on these can be found in the article "The 1884 Connection: A History of the 1878 U.S. Gold Patterns" in the November 1981 issue of The Numismatist.
Photo courtesy of PCGS.