Cleaning an attic usually results in bags of trash and maybe some old high school notebooks saved for some unknown reason. Recently, a French family made the discovery of a lifetime — maybe even a couple of lifetimes — when they found an intricately decorated porcelain vase in an old shoebox. Recognizing that they may have found something unique, the family had it appraised by Sotheby’s Paris. They did, indeed, find a treasure: the vase is dated from the Qing dynasty, the last imperial dynasty of China that started in 1636 and lasted to 1912. The vase, decorated with animals, trees and embellishments, could be worth more than $600,000. The Yangcai Famille Rose porcelain vase bears a mark from the reign of the Qianlong Emperor, who ruled China from 1736 to 1795.

The vase, according to Sotheby’s, was willed to the grandparents of its present owners by an uncle. Their inheritance  also included several other works of Chinese porcelain and some Japanese artworks, including an “unusual bronze mirror.”  Both the vase and the mirror will be sold at the Arte d’Asie auction being held at Sotheby’s Paris on June 12.

UPDATE: The vase sold for $19 million at auction on June 12, more than 20 times the estimate. It was the highest price reached for a single item sold by Sotheby’s in France.