The story behind the coin
The quarter eagle was born with the country. The Mint Act of 1792 created it — a gold coin worth two and a half dollars — and the first ones came off the press in 1796. The name is plain arithmetic: the ten-dollar gold piece was the "eagle," so this was a quarter of one. For its first half-century it was the smallest gold coin the United States made, the kind of money you used for a real purchase, not pocket change.
Then California changed everything. In January 1848, a carpenter named James Marshall spotted gold flecks in a sawmill race on the American River. Within months, the territory's military governor shipped roughly 230 ounces of that raw California gold east to Washington. The Mint struck it into quarter eagles — and stamped a tiny "CAL." above the eagle on the back of each one, so the world would know where the metal came from. Many collectors call that 1848 "CAL." piece America's first commemorative coin, struck 44 years before the country got around to making one on purpose.
The coin outlived the Gold Rush, the Civil War, and the Gilded Age. It only stopped in 1929 — and then, in 1933, the government recalled gold coins from circulation altogether. The quarter eagle didn't fade away. It was, in effect, switched off.