1915-S Panama-Pacific Exposition. MS-64 (PCGS). CAC.，This half dollar is beautifully toned with multicolored patina that is most vivid and varied around the peripheries. This type was issued in connection with the Panama-Pacific International Exposition that was staged in San Francisco in 1915 to celebrate the rebirth of the city after the 1906 fire and the 1914 completion of the Panama Canal, one of the greatest engineering feats of the era. All of the Panama-Pacific commemorative coins -- ranging from 50 cents to 50 dollars (five different varieties in all) -- were struck at the San Francisco Mint. The half dollar has a net mintage of 27,134 pieces after 32,866 undistributed examples were returned to the Mint for melting.，From the A.J. Vanderbilt Collection. Earlier from our (Coin Galleries) Martin F. Kortjohn Collection sale, November 1979, lot 1666.，
