USA 20 Dollars 1876 S San Francisco. 'Liberty Head - Double Eagle'

USA 20 Dollars 1876 S San Francisco. 'Liberty Head - Double Eagle' with motto 'TWENTY D'. Averse: Liberty head wearing a tiara; the 13 stars of the union around the rim and the date below. Lettering: LIBERTY 1876. Reverse: A heraldic eagle with the denomination below. Lettering: UNITED STATES OF AMERICA IN GOD WE TRUST E PLURIBUS UNUM TWENTY D. Gold. KM 74.2. PCGS AU55