1915-S Panama-Pacific Exposition $50. Octagonal. MS-64 (NGC). CAC. Beautiful lemon-yellow coloration sparkles across each side of this Choice Mint State example. The surfaces are fully lustrous with a billowy, softly frosted texture from the dies. Smartly impressed, as befits the issue, with an uncommonly smooth appearance for a survivor of this scarce and conditionally challenging type. Obviously handled with greater care than most Panama-Pacific Exposition $50s that have come down to the present day, this original and highly attractive coin is sure to catch the eye of discerning collectors. A trivial mark at 5 oclock on the obverse rim serves as a convenient pedigree marker, and a green CAC sticker of approval will surely increase the desirability. A net mintage of 645 pieces leaves few to go around today, and these have been increasingly sought after since the Commemorative boom of the 1930s. They remain the key to the Commemorative gold series along with the Round format of the same issue.