Lot 132. A 'Jian' black-glazed bowl, Song Dynasty (960-1279). Estimate 4,000 — 6,000 USD. Photo: 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. Diameter 4 7/8  in., 12.4 cm

Sotheby's. Important Chinese Art, New York, 13 sept. 2016, 10:30 AM