The U.S. Mint launched the National Baseball Hall of Fame Commemorative Coin Program in 2014. It celebrated the National Baseball Hall of Fame’s 75th anniversary. The program includes a $5 gold coin, $1 silver coin, and a half dollar clad coin with the same obverse and reverse designs.
From April 11 to May 11, 2013, a nationwide competition was held to determine the obverse design for the coin.
Curved, Not Flat
The National Baseball Hall of Fame Commemorative Coins have a shape such that the obverse is concave, and the reverse is convex. These were the first curved coins ever minted by the U.S. Mint. However, the Mint did produce a curved Congressional Gold Medal in honor of Pittsburgh Pirates Hall of Famer Roberto Walker Clemente in 1973.
The National Baseball Commemorative Coin Act specifically refers to modeling the coins after the convex/concave 2009 International Year of Astronomy Coins minted and issued by the Monnaie de Paris (French Mint). The baseball commemorative coins were also closely modeled after the Royal Australian Mint’s Southern Cross curved coins.
Research and development on the curved National Baseball Hall of Fame Commemorative Coins was unprecedented in recent U.S. Mint history. It covered height of relief limitations; milling, turning and grinding operations; coinability issues; laser frosting and proof polishing; and proof, uncirculated, and clad test strikes.
During the planning phase for the minting and production of its first-ever curved coins, the Mint received valuable technical insight from the Royal Australian and Perth Mints.