Lot 642. A carved 'Yaozhou' celadon-glazed bowl, Northern Song dynasty (960–1127). Estimate 2,500 — 3,500 USD. Photo: Sotheby's.

the conical body flaring from a shallow foot to a slightly everted rim, the interior freely carved and combed with a foliate scroll, the exterior with radiating vertical lines, covered overall with an olive-green glaze pooling to darker tones within the carved recesses. Diameter 7 1/8  in., 18.2 cm 

Sotheby's. Important Chinese Art, New York, 14 Mar 2017, 10:30 AM