A group of silmilarly carved bi, dated c. 122 BC, were found on the lower part of the jade suit of the King of Nanyue at Xinggang, Guangzhou, Guangdong province. See J. Rawson, Chinese Jade from the Neolithic to the Qing, London, 1995, p. 73, fig. 67, and Gu Fang, The Complete Collection of Unearthed Jades in China, vol. 11, Beijing, 2005, no. 51. Compare two other similar bi illustrated by the Institute of Archaeology, Excavations of the Han Tombs at Mancheng, vol. II, Beijing, 1980, pl. CCX, figs. 1 and 2.