For very similar stemcups, cf. Ayers, The Baur Collection, vol. III, A418, 419; the National Palace Museum, Taibei, Special Exhibition of K'ang Hsi, Yung-Cheng and Ch'ien-Lung Porcelain Ware from the Ch'ing Dynasty, 1986, Catalogue, no. 83; the Palace Museum, Beijing, special exhibition in Kaohsiung City, Great National Treasures of China, Catalogue, p.282, fig.74