SAN FRANCISCO — The United States Mint will begin selling special curved coins this month to honor the National Baseball Hall of Fame, with a design representing the inverse images of a ball and mitt, US Mint officials said on Thursday. The $5, $1 and half-dollar coins, plated with gold, silver and alloy, are in production at the San Francisco US Mint and will be sold online starting on March 27, agency spokesman Michael White said. Some 50,000 $5 gold coins, 400,000 $1 silver coins and 750,000 half-dollar alloy-clad coins will be produced. They will be the first curved coins — concave on the heads side and convex on the reverse — ever minted by the US Mint, according to a statement on the agency's website. The image of a baseball glove with the words “liberty” and “in God we trust 2014” across the palm is featured on the face of the coins, which commemorate the Baseball Hall of Fame's 75th year in 2014. A baseball is depicted on the tails side, with the words “United States of America” and the coin's value inscribed on it. The tails side also includes the Latin words for “Out of many, one.” — Reuters