A workman at a French winery was stunned when he discovered nearly 500 U.S. gold coins while working on a renovation project at the winery.Bonhams will offer at auction June 3 in Los Angeles the Champagne Lanson Bonnet Vineyard Collection of 497 Coronet and Saint-Gaudens gold $20 double eagles, bearing dates between 1851 and 1928.

read more U.S. gold coins fall like rain from ceiling in French.