Compare with a similar pair of related crossbow fittings from the Pierre Uldry Collection published in Chinesisches Gold Und Silber, Rietberg Museum, Zurich, 1994, exhibition catalogue, no. 28a; also published by Eskenazi, Early Chinese Art from Tombs and Temples, 1993, exhibition catalogue, no.10.

Thomas Lawton provides an illuminating account of the evolution of cross-bow fittings in Chinese Art of the Warring States Period: Change and Continuity 480-222 BC, Freer Gallery of Art, Washington DC, exhibition catalogue 1982, pp. 65-67