The form and glaze of this vase are based on Song dynasty prototypes, such as the Guanyao vases in the National Palace Museum, Taiwan, illustrated in Kuan Ware of the Southern Sung Dynasty, Hong Kong, 1962, Book II, pls. 1 and 2.
A related, though much smaller (13.5 cm. high) ru-type hu vase, also with Qianlong seal mark, in the Qing Court Collection, is illustrated in The Complete Collection of Treasures of the Palace Museum - 37 - Monochrome Porcelain, Hong Kong, 1999, p. 238, no. 216.