A Sotheby's employee looks at a painting, a portrait of Giovanni Gaddi 

A Sotheby's employee looks at a painting, a portrait of Giovanni Gaddi (1493-1542) which is yet to find a convincing attribution, during a press viewing in London, Friday, Nov. 30, 2012. The painting estimated at 600,000-800,000 pounds (960,500-1,280,500 US Dollars) will go on sale in the evening sale of Old Master Paintings and Drawings on Dec. 5 in London. (AP Photo/Kirsty Wigglesworth)
Associated Press
A Sotheby's employee looks at a painting, a portrait of Giovanni Gaddi (1493-1542) which is yet to find a convincing attribution, during a press viewing in London, Friday, Nov. 30, 2012. The painting estimated at 600,000-800,000 pounds (960,500-1,280,500 US Dollars) will go on sale in the evening sale of Old Master Paintings and Drawings on Dec. 5 in London. (AP Photo/Kirsty Wigglesworth)
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