The shape is highly unusual and resembles monochrome-glazed amphora, the liuye zun or 'willow-leaf vase', from the earlier Kangxi period, such as the peachbloom-glazed amphora sold at Christie's Hong Kong, 31 October 2000, lot 868. Whilst the amphora is potted with a slim, elongated body, the present vase is much larger, has a sturdier body and a broader footring. For a related Yongzheng-marked yellow-glazed vase with a flaring mouthrim and slimmer body, in the Palace Museum collection, Beijing, see Kangxi Yongzheng Qianlong, Hong Kong, 1989, p. 175, no. 4
A vase of this shape bearing a Qianlong mark but with a clair-de-lune
glaze was sold at Christie's Hong Kong, 31 October 2000, lot 869.