Cf. an Yixing cup dated 1600 in the Percival David Foundation, London, and an album leaf from the Lidai mingci tupu, attributed to the well-known collector Xiang Yuanbian (1525-1590), with the design for this inkstone, illustrated and discussed by Michel Beurdeley, The Chinese Collector through the Centuries, pp. 133-4, figs. 69 & 70