Compare with similar Qianlong-marked jars with covers such as the example illustrated in Chinese Porcelain: The S. C. Ko Tianminlou Collection, vol. 1, Hong Kong Museum of Art, 1987, pl. 114; one illustrated in Porcelain of the National Palace Museum, Enamelled Ware of the Ch'ing Dynasty, Book II, Hong Kong, 1969, pls. 13 a-d; one in the Jingdezhen Ceramic Museum, illustrated in Heitokuchin Jiki, Kyoto, 1982, pl. 118; two pairs sold in these Rooms, 9 December 1985, lot 141, and 15 November 2000, lot 65; and a single jar and cover which sold in our Hong Kong Rooms, 30 May 2006, lot 1443.