For similar bottles see Bob C. Stevens, The Collector's Book of Snuff Bottles, 1976, col. pl. 709, and Hugh M. Moss, Snuff Bottles of China, 1971, no. 158, and illustrated on the dust jacket; also illustrated by Hugh M. Moss, Chinese Snuff Bottles, no. 2, back cover advertisement for Sidney L. Moss Ltd., originally in the H.R.N. Norton Collection. For a another pig bottle in white nephrite jade see Robert W.L. Kleiner, Chinese Snuff Bottles from the Collection of Mary and George Bloch, Hong Kong, 1987, col. pl. 56. The pig is the last of the twelve creatures in the Chinese zodiac and it symbolises virility