A coin collector paid a record $8.5 million for a set of rare coins said to have been a gift from former President Andrew Jackson to the King of Siam.

Steven L. Contursi, president of Rare Coin Wholesalers, bought the set of 19th century gold, silver and copper coins from an anonymous owner described only as "a West Coast business executive," according to Donn Pearlman, the buyer's publicist.

"It's the largest single transaction for a single item ever in coin history," Contursi said. "It sounds like a lot of money, but when you put it into perspective, it seems like a good price. There are paintings going for millions."

The coins were last purchased for more than $4 million in 2001. At face value, they range from a copper half cent to a $10 gold piece, Pearlman said. A collectibles firm brokered the purchase Tuesday.

In 1836, then President Andrew Jackson presented the King Ph'ra Nang Klao (Rama III) of Siam, now Thailand, with the diplomatic gift. The Broadway musical "The King and I" fictionalized the king's son, Rama IV, who inherited the coins.