½ Dollar (Pilgrim Tercentenary)

The Pilgrim Half Dollar: a 300-year anniversary, struck two years running

In 1920, the United States minted a coin to mark 300 years since the Pilgrims landed at Plymouth. The next year it minted the same coin again — with a tiny "1921" added so collectors would need to buy both. Most of that second batch never sold, and the Mint melted it down. That melting is exactly why the 1921 Pilgrim is the one people chase today.