Note: A closely related washer, from the collections of the J.M. Hu family and Robert Chang, was sold in our New York rooms, 4th June 1985, lot 65, and again at Christie's Hong Kong, 2nd November 1999, lot 517; and two were sold in these rooms, 29th April 1998, lot 768, and 24th May 1978, lot 210. See examples covered in a Ru-type glaze, such as one sold in these rooms, 22nd May 1985, lot 222; another sold in our London rooms, 10th November, lot 210; and a smaller washer in the Nanjing Museum, illustrated in The Official Kiln Porcelain of the Chinese Qing Dynasty, Shanghai, 2003, p. 334. A Guan-type washer of this form and size, but with a Yongzheng reign mark and of the period, formerly in the Carl Kempe collection and now in the Museum of Far Eastern Antiquities, Stockholm, is published in Oriental Ceramics. The World's Great Collection, vol. 8, Tokyo, 1982, pl. 274; and another with a clair-de-lune glaze, in the Palace Museum, Beijing, is included in Qingdai yuyao ciqi, vol. 1, pt. II, Beijing, 2005, pl. 205.