A similar bronze axe, with even larger hole in the blade, from Henan Luoyang, dated early Western Zhou, is illustrated by J. So, "To Restore or Not: A Case Study", Oriental Art, Spring, 1996, pp. 24-9, fig. 11. Another, of similar type, is illustrated by B. Karlgren, "Bronzes in the Hellström Collection", BMFEA 20, 1948, pl. 19 (1).