A Qingbai octagonal ewer and cover, Northern Song dynasty | 北宋 青白釉八方連蓋執壺

A nearly identical ewer and cover, dated to the 11th century, is in the Minneapolis Institute of Art, Minneapolis (accession no. 2001.135.1A,B). Another ewer of the same form and size, also attributed to the Northern Song dynasty, is published in the The Museum of East Asian Art, Inaugural Exhibition, vol. I, Bath, 1993, cat. no. 59.