1915-S Panama-Pacific Exposition $50. Octagonal. MS-63 (PCGS). Our multiple offerings in this sale notwithstanding, this is a scarce issue in an absolute sense that can be challenging to locate in todays market. Indeed, most survivors from a net mintage of 645 coins are in tightly held collections, confirming the significance of the present offerings for the advanced commemorative enthusiast. The flashy Choice Mint State example in this lot exhibits bright medium gold patina to both sides, a touch of pale olive also evident as the surfaces rotate away from direct lighting. Lustrous with a satin to softly frosted finish, sharp striking detail and an uncommonly smooth appearance in hand further enhance the desirability of this lovely Panama-Pacific octagonal $50.