An rare 15th century porcelain bowl made in China somehow turned up at a Connecticut yard sale and sold for just $35. The small white bowl adorned with cobalt blue paintings of flowers and other designs is one of only seven such bowls known to exist in the world. Sotheby’s had estimated the value of the artifact at $300,000 to $500,000. Wednesday’s auction included 15 bids, starting at $200,000 from someone online and ending at $580,000 from another person bidding by phone. The official purchase price, which included various fees, was almost $722k.