5 Dollars (National Baseball Hall of Fame)

2014 Baseball Hall of Fame $5 Gold: The First Coin That Curved

In 2014 the US Mint did something it had not done in its 222-year history: it struck a coin that bends. Hold the Baseball Hall of Fame half eagle and one face cups inward like a catcher's mitt; flip it and the other bulges out like the ball settling into the pocket. It was the first curved coin America ever made.