Compare the pair of similar white jade bowls, also unmarked and dated to the 18th century, in the collection of Sir Joseph Hotung illustrated by Jessica Rawson, Chinese Jade, from the Neolithic to the Qing, British Museum, 1995, p. 400, no. 29:13; and another, of slightly smaller size (13.5cm.), included in the O.C.S. exhibition, Chinese Jade throughout the Ages, London, May 1-June 22, 1975, Catalogue, no. 436