The pattern of pierced, elongated triangles on the this vase can be compared to the decoration on an unglazed earthenware boshanlu dated to the early Western Han period, illustrated by R. Castile, in 'The Asian Art Museum of San Francisco, The Avery Brundage Collection', Orientations, January 1987, p. 26, and also to that on another boshanlu of the same period, but glazed, illustrated by W. Willets, Foundations of Chinese Art, London, 1965, p. 277, no. 154.
Compare, also, the very similar vase from the Jingguantang Collection, Part II, sold in these rooms, 20 March 1997, lot 48.
The result of Oxford Authentication Ltd. thermoluminescence test no. P199e18 is consistent with the dating of this lot.