A similar copper-inlaid bronze hu in the Sen'oku Hakkokan, dated to the 4th century BC, is illustrated by J. So in Eastern Zhou Ritual Bronzes from the Arthur M. Sackler Collections, Arthur M. Sackler Foundation, 1995, p. 281, fig. 50.1, where the author notes that the copper inlay was applied to the clay molds before the bronze was poured. Similar copper-inlaid bands and chevrons can also be seen on a he dated to the mid-Warring States period, 5th century BC, illustrated by L. d'Argencé, Bronze Vessels of Ancient China in the Avery Brundage Collection, San Francisco, 1977, p. 131, pl. LVII (upper right).