This coin is a true show-stopper! 1915 S Panama Pacific PAN-PAC Commemorative Half Dollar MS BU TONED!!! Mintage of 27,134 coins issued in San Francisco to celebrate the opening of the Panama Canal. Designed by Charles E. Barber (obverse) and George T. Morgan (reverse) was the first commem to carry the motto IN GOD WE TRUST. Classic Silver Commemorative.