QIANLONG SIX-CHARACTER SEAL MARK IN UNDERGLAZE BLUE AND OF THE PERIOD (1723-1735)

Compare with a similar Qianlong vase also covered with a Guan-type glaze in the Hong Kong Museum of Art, included in the exhibition catalogue of The Wonders of the Potter's Palette, Hong Kong, 1984, no. 80, and another from the T.Y. Chao Collection, sold at Sotheby's Hong Kong, 19 May 1987, lot 288.

Two other Qianlong vases of this rare form, but covered with a teadust glaze, are illustrated in Chinese Ceramics in the Idemitsu Collection, no. 963, and Sekai Toji Zenshu, vol. 11, no. 99, in the Hakutsuru Art Museum, Hyogo.