The 1921 Missouri Centennial Half Dollar

Missouri entered the Union on August 10, 1821 — the deal at the heart of the Missouri Compromise, the bargain that let one slave state and one free state in together and held a fracturing country together a little longer. A hundred years later, the state wanted a party.

The plan was a grand exposition in Sedalia, and a souvenir to sell at it: a commemorative half dollar. Congress agreed. The authorizing bill passed without recorded opposition, and President Warren G. Harding signed it into law on March 4, 1921 — his inauguration day.

Here is the part that still stings collectors a century on. The coins were struck. The exposition came and went in August 1921. And the country was in the grip of the sharp postwar Recession of 1921, with little advance publicity for the sale. Souvenir half dollars at a dollar apiece — twice face value — were a hard sell to a half-empty fairground. The unsold coins went back to the Philadelphia Mint and into the furnace. By the end, almost 60% of the plain coins had been returned and melted. The survivors are the coin we chase today.

The Mint turned to Robert Ingersoll Aitken, the sculptor who had already given American coinage the spectacular Panama-Pacific $50 gold pieces of 1915. He reached for Missouri's founding myth: Daniel Boone, the frontiersman.

The obverse — the heads side — is Boone in a deerskin jacket and coonskin cap. The reverse stages the whole frontier idea in one scene: Boone, rifle and powder horn in hand, gesturing a Native American figure westward, ringed by 24 stars. It is unmistakably a monument to westward expansion told from the settlers' side, the way 1921 understood the story. Aitken tucked his "RA" monogram near the rifle butt, and "SEDALIA" sits in the exergue — the flat space below the design — naming the town that hosted the celebration.

Then there is the gimmick that made the coin famous. On a portion of the run, a tiny "2★4" was punched into the obverse field — a 2, a star, a 4. It reads "twenty-fourth," because Missouri was the 24th state admitted to the Union. The organizers meant to sell these marked pieces at a premium to cover costs. They became, instead, the prize variety of the whole series.

The Missouri Centennial is a two-coin set hiding inside one issue. The "Plain" coin is the base type; the "2★4" — the one with the punched marking — is the variety collectors prize. Both are scarce because so few were sold and so many were destroyed, which is why the Missouri sits among the genuinely tough keys of the classic commemorative half dollar series (the long run of silver souvenir 50-cent pieces struck between 1892 and 1954).

A wrinkle worth knowing: the exact 2★4 mintage is unsettled. Older references (Swiatek and Breen) put it near 5,000; others have argued for roughly 10,000; the more recent Red Book (Yeoman) estimate is about 9,400, against roughly 11,400 plain coins. The honest answer is that nobody can pin the surviving number precisely — and that uncertainty is part of why the variety is so closely watched.

Condition tells the rest of the story. These coins were handled, carried, and pocketed as souvenirs, so high-grade survivors with full, original luster are far scarcer than the raw distribution numbers suggest. The jump in desirability — and price — from a circulated example to a crisp mint-state coin is steep, and steeper still for the 2★4.