A most unusual feature of this gu is the two narrow bands of long-tailed birds flanking the middle section, which are more naturalistically rendered than the more angular, hook-beaked birds commonly encountered on bronzes of the late Shang and early Western Zhou periods.
A very similar gu with almost identical cast elements, but with narrow bands of cicadas and dragons rather than birds, in the collection of C. Hollinger-Hasler, Winterthur, Switzerland, is illustrated by H. Brinker, Bronzen aus dem alten China, Zurich, 1975, p. 78, no. 35. See, also, the gu illustrated by R.W. Bagley, Shang Ritual Bronzes in the Arthur M. Sackler Collections, Arthur M. Sackler Foundation, 1987, pp. 240-1, no. 33, which also has similar decoration, but has narrow bands of snakes and cicadas.