½ Dollar (Alabama Centennial)

The Alabama Centennial Half Dollar — the coin that broke two rules

In 1921 the Mint did two things it had never done before, both on the same fifty-cent piece. It let a woman design a US coin, and it put a living man's face on American money. Then it quietly stamped a few thousand of them with a tiny "2x2" — and a single coin became two prizes.