Cf. two identical Qianlong-marked examples of this conjoined double-gourd form, the first is illustrated by R. Krahl, Chinese Ceramics from the Meiyingtang Collection, London, 1994, vol. 2, p. 217, no. 876; and another is in the Asian Art Museum of San Francisco, illustrated by He Li, Chinese Ceramics, A New Comprehensive Survey, 1996, no. 521. Compare with another vase, seemingly without any crackles, in the Baur collection, illustrated by J. Ayers, Chinese Ceramics in the Baur Collection, Geneva, 1999, vol. 2, p. 164, no. 270, A336. A pair of these vases was sold at Christie's Hong Kong, 1 October 1991, lot 812.