A larger (23.7 cm.) gu with similar cast decoration around the midsection, but cast with additional taotie on the spreading foot, is illustrated by R.W. Bagley, Shang Ritual Bronzes in the Arthur M. Sackler Collections, The Arthur M. Sackler Foundation, 1987, p. 258, no. 40, where it is dated 13th-12th century BC.
A Technical Examination Report is available upon request.