Similar to an ox included in the exhibition, Animals and Animal Designs in Chinese Art, Eskenazi, New York, 24 March - 4 April 1998, no. 14, also dated to Northern Qi. For an ox excavated in Wangguo Village, Taiyuan, Shaanxi Province in 1981, see Son of Heaven, Chinese Overseas Archealogical Exhibition Corporation, Beijing, Catalogue, p. 190, pl. 123.
The dating of this lot is consistent with the result of the Oxford Authentication Ltd. thermoluminescence test number C103m2.