For another bottle of this type see Sotheby's, Important Chinese Snuff Bottles, London, June 6, 1988, lot 229, and Clare Lawrence, Chinese Snuff Bottle Engagement Diary, 1993, December/January, from the Exstein Collection. For an example of more rounded shape see Hugh Moss, Victor Graham, Ka Bo Tsang, The Art of the Chinese Snuff Bottle, The J & J Collection, p. 171, no. 93 and no. 94, where the authors discuss the material and its use for snuff bottles. For another see Chinese Snuff Bottles from the Fernhill Park Collection, The Chinese Porcelain Company, New York, 1991, Catalogue no. 152, p. 37