The story behind the coin
In 1915, San Francisco threw a party for the whole world. The Panama Canal had just opened, splicing the Atlantic and Pacific into one ocean of trade. And the city itself had clawed its way back from the 1906 earthquake and fire that nearly erased it. The Panama-Pacific International Exposition — a sprawling fairground of palaces and lagoons that ran from February to December 1915 — was the proof: we are still here, and we are open for business.
A fair this big wanted souvenirs with weight. So Congress obliged. On January 16, 1915, President Woodrow Wilson signed the act authorizing not one commemorative coin but five — a silver half dollar, this gold dollar, a gold quarter eagle ($2.50), and two enormous $50 gold pieces, one round and one eight-sided. It was the most ambitious commemorative program the country had ever attempted, and every coin carried the San Francisco mint mark, an "S," struck at the city the fair was celebrating.
The gold dollar was the smallest of the five and, at face value, the most modest. But it did something quietly radical. Where most coins of the age reached for gods, eagles, and Liberty, this one looked down — at the men who actually dug the ditch.