DALLAS — Thirty coins stamped by the U.S. Mint in the 19th century to test designs and metals were sold at auction for more than a half-million dollars.

Dallas-based Heritage Auctions had expected the coins to sell Thursday night for more than $300,000. Heritage spokesman Noah Fleisher said they sold for a total of $505,440.

The highest price was $76,375 for an 1871 silver dollar.

The coins from the collection of a late Dallas businessman were sold at the American Numismatic Association’s World’s Fair of Money near Chicago.