Cecilia Leung of Sotheby's said the bowl, which measures about 5 inches in diameter, had been purchased by the seller, whose name was not released, at a yard sale in 2007 and displayed in their living room for several years before the owner decided to have it appraised, CNN reported Wednesday.
The bowl was found to be a 1,000-year old example of Northern Song Dynasty pottery.
The object was purchased by London dealer Giuseppe Eskenazi.
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