Lot 3006. A Ge-type cong vase, seal mark and period of Qianlong (1736-1795); 28 cm., 11 in. Estimate 180,000 — 250,000. Lot sold 1,100,000 HKD. Photo Sotheby's 2011

modelled after the archaic jade prototype, of square section with a short cylindrical neck, each side moulded in relief with two columns of short dashes representing the 'Eight  Daoist Trigrams', covered overall with an even ash-grey glaze suffused with a fine network of black-stained crackles. 

Sotheby's. Fine Chinese Ceramics and Works of Art, Hong Kong, 08 april 2011.