A celadon-glazed vase of this very unusual shape with an unusual Qianlong mark, and of slightly smaller size (25.2 cm. high) in the Wang Xing Lou Collection is illustrated in Imperial Perfection: The Palace Porcelain of Three Chinese Emperors, Hong Kong, 2003, pp. 186-7, no. 69. Compare, also, the Yongzheng-marked Ru-type vase of very similar shape and of approximately the same size, from the J.M. Hu Family Collection, offered at Sotheby's, New York, 4 June 1985, lot 56.