The single pictograph cast inside the interior of the foot of this gu, usually deciphered as zheng (upright), consists of a rounded square and a pair of footprints. A similar graph appears in a jia illustrated by R.W. Bagley, Shang Ritual Bronzes in the Arthur M. Sackler Collections, The Arthur M. Sackler Foundation, 1987, pp. 158-9, no. 5, who mentions that, although the character is usually taken to be the name of a person, clan or place, the excavation of a yu from a burial near Fu Hao's tomb suggests that it was the name of a marquisate. Bagley cites thirteen other published bronzes in public and private collections which bear this pictograph.
A very similar gu is illustrated by Bagley, ibid., pp. 228-9, no. 29. Another similar example excavated from Xibeigang M1550 at Anyang is illustrated by Li Ji and Wan Jiabao, Yinxu chutu qingtong gu xing qi zhi yanjiu (Studies of the Bronze Gu-Beaker), Taiwan, 1964, pl. 34 and p. 87, fig. 29.