Lot 3413. A transparent blue glass octagonal water pot, Qianlong incised four-character mark within a square and of the period (1736-1795); 3 in. (7.6 cm.) across. Estimate HKD 200,000 - HKD 300,000. Price Realized HKD 400,000. © Christie's Images Ltd 2013 

The water pot is of compressed globular section and divided into eight facets by raised vertical ridges. The transparent metal of light blue tone, box. 

Christie's. Important Chinese Ceramics and Works of Art (Including The Su Zhu An Collection of Inkstones), Hong Kong, 27 November 2013