UNITED STATES. Panama-Pacific International Exposition, 1915. Official Medal. San Francisco. Silver "So Called Dollar" 30.18 gm. 38 mm. The official silver dollar from the exposition. Winged Mercury opening the Panama Canal locks; the Argo (from Jason and the Argonaughts, a symbol of navigation) sailing through; "ON! SAIL ON! in small letters below left; TO COMMEMORATE THE OPENING OF THE PANAMA CANAL MCMXV around / Two female figures representing the hemispheres reaching across a globe holding cornucopias, a seagull below; PANAMA PACIFIC INTERNATIONAL EXPOSITION SAN FRANCISCO CALIFORNIA MCMXV around. HK 399. Uncirculated; lustrous with hints of light toning.