Octagonal Gold 50-Dollars, 1915S, San Francisco, head of Minerva left, rev owl on California pine branch, E PLURIBUS UNUM to right (F 189; KM 139)Only 483 struck. In 1915 visitors from all over the world converged on a veritable new city that had been built of lath and plaster on the San Francisco shore front. Building upon the tradition established by the 1876 Centennial Exhibition (Philadel ...