Compare the vase of this shape, dated to the Yongzheng period, glazed in imitation of jun ware, in the Baur Collection, illustrated by John Ayers in the Catalogue, vol. III, Geneva, 1972, pl. A353, where the author notes that the form of this vase is 'no doubt based on that of an ancient bronze vessel, hu', and that the mark on the base, Xuan he, 'must be a reference to the celebrated collection of antiquities of the Emperor Hui Tsung (1082-1135) of the Song dynasty, a manuscript catalogue of which, the Xuan he po gu tu lu was printed c. 1310, and reprinted on various occasions thereafter.' The present example could also be based on an ancient bronze shape or could be based on longquan or guan vases of this shape, themselves influenced by early bronze forms, which were produced during the Song dynasty. See the longquan example in the collection of Mrs. Alfred Clark, illustrated by Gompertz, Chinese Celadon Wares, London, 1958, pl. 73B and the guanyao example included in the exhibition, Treasures from the Palace Museum, Tokyo, 1982, Catalogue, p. 75, pl. 44