Lot 393. A large black-glazed ribbed jar, Northern Song-Jin dynasty; 27.5 cm, 10 7/8  in. Estimate 30,000 — 40,000 HKD. Photo: Sotheby's.

of ovoid form with a pair of strap handles, the body with sections of sharply defined vertical ribs, covered overall in a black glaze thinning to russet at the raised ribs, the glaze stopping short above the foot revealing a brown slip underneath.