Deng shu-ping believes five jades in the collection of the National Palace Museum, Taipei, could be attributed to Lu Zigang, on which deliberate knife-like tool marks were found on the signatures to evoke a feeling of antiquity; see ‘Exploring "Zi-gang": Contemplation of Carved Jade Mysteries from Jiangnan in Late Ming Dynasty’, The National Palace Museum Monthly of Chinese Art, December 2011, no. 345, pp. 46-62. The five examples in the Taipei Palace Museum include a yellow jade washer with a signature comparable to that of the present lot (p. 56, fig. 6) and a celadon ‘chilong’ box and cover with a similar inscription (p. 57, fig. 8). See another jade ‘chilong’ hairpin from the late Ming also in the National Palace Museum, Taipei, inscribed with two raised characters in seal script reading Zigang, included in Art in Quest of Heaven and Truth: Chinese Jades through the Ages, National Palace Museum, Taipei, 2011, p. 137, fig. 7-2-9. There is a further signed white jade ‘chilong’ hairpin excavated from the Wanli period tomb of Xu Yufu, Jiangsu, preserved in the Nanjing Museum.