The first gold commemorative coin was the 1903 Louisiana Purchase Exposition Gold Dollar. It came in two varieties--Thomas Jefferson and William McKinley.
GreatCollections has sold 5 of the 1915-S Panama-Pacific Expostion $50 Gold, Round in the past 10 years, selling at prices from $50,600 to $125,400, in grades 1 to 64. Of these, 4 were approved by CAC.
The industry number is 7451.