Compare the smaller amphorae of this type, but with cup-shaped mouth: one included in the exhibition, Ancient Chinese Ceramics from the Neolithic Period to the Western Han, Uragami Sokyu-do, Co., Tokyo, 1991, no. 2; one from the Honolulu Academy of the Arts in the exhibition, Origins of Chinese Ceramics, China Institute, New York, 25 October 1978 - 28 January 1979, no. 1; and another in the British Museum, illustrated in Oriental Ceramics, The World's Great Collections, Tokyo, 1981, vol. 5, pl. 1.
The result of Oxford Authentication Ltd. thermoluminescence test no. C299k69 is consistent with the dating of this lot.