HARTFORD, Conn. (AP) — A rare 15th century porcelain bowl made in China that somehow turned up at a Connecticut yard sale and sold for just $35 has been auctioned off for nearly $722,000. The small white bowl adorned with cobalt blue paintings of flowers and other designs was sold Wednesday at a Sotheby’s auction. It’s one of only seven such bowls known to exist in the world. The names of the seller and buyer were not disclosed. Sotheby’s had estimated its value at $300,000 to $500,000. Sotheby’s says an antiques enthusiast came across the Ming Dynasty piece at a yard sale in the New Haven area last year.