Previously sold in Hong Kong, 17 May 1989, lot 458.
Double vases of this shape carved from glass are very rare. A comparable example with archaistic dragons over one half and scrolling lotus over the other half through a layer of red to an opaque white ground from the Palace Museum, Beijing, also with an incised Qianlong four-character mark, is illustrated in Zhongguo Meishu Quanji, vol. 10, p. 141, col. pl. 265.
Porcelain versions of this distinctive shape are more common. A blue and white example painted with archaistic phoenixes and dragons from the National Palace Museum, Taiwan, was included in the special Exhibition of Kangxi, Yongzheng, Qianlong Porcelain, Catalogue, p. 100, col. pl. 70. A famille rose example with floral meanders alternatively on a blue and pink ground from the Palace Museum, Beijing, is illustrated in Kangxi, Yongzheng, Qianlong, p. 378, col. pl. 59.