Lot 631. A sky-blue 'Jun' bowl, Northern Song dynasty (960-1127). Diameter 7 1/2 in., 18.8 cm. Estimate: US$6,000 - US$8,000. Unsold. Courtesy Sotheby's.

the deep rounded sides supported on a low spreading foot, covered overall in an unctuous sky-blue glaze thinning at the rim to a mushroom tone, the foot burnt to russet brown during firing.