1915-S $50 Panama-Pacific 50 Dollar Round (rev) (1209-3551)
Heritage Auctions (image); U.S. Mint (coin)
Image (2014)  coin (1915)
Heritage Auctions <a rel="nofollow" class="external text" href="https://coins.ha.com/itm/commemorative-gold/classic-commemoratives/1915-s-50-panama-pacific-50-dollar-round-ms65-pcgs/a/1209-3551.s">Lot 3551</a>, 4 September 2014