A fine and very rare large sky-blue-glazed hexagonal vase, Qianlong four-character seal mark and of the period. Photo courtesy Bonhams.

Heavily potted with vertically-ribbed sides, a splayed foot, high shoulders and a flaring trumpet neck, covered all over in thick lustrous sky-blue glaze with natural irregular craqueleur. 46.8cm high. Estimate HK$ 1.2 million - 1.6 million (€110,000 - 150,000)

Compare a similar-sized and related hexagonal vase with Yongzheng seal mark in the Qing court collection, Palace Museum, Beijing, illustrated in Monochrome Porcelain. The Complete Collection of the Treasures of the Palace Museum, Shanghai, 1999, p.226, no.204.

Bonhams. FINE CHINESE CERAMICS AND WORKS OF ART. Hong Kong. 24 Nov 2013 14:00 CST