Lot 950. A 'Jian' black-glazed bowl, Song dynasty (960-1279). Diameter 4 7/8  in., 12.4 cm. Estimate 2,000 — 3,000 USD. Lot sold 3,750 USD. © Sotheby's

the deep rounded sides rising from a slightly tapered foot, with a narrow groove encircling the exterior below the rim, covered overall with a lustrous black glaze, thinning at the rim with subtle streaks extending downwards, the glaze stopping unevenly above the foot to reveal the dark-gray stoneware body.

Sotheby's. Saturday at Sotheby's: Asian Art, New York, 16 Sep 2017