For a bottle of similar type see Sotheby's, London, Fine Chinese Snuff Bottles, April 24, 1989, lot 291, and also a larger example illustrated by Bob C. Stevens, The Collector's Book of Snuff Bottles, col. pl. 229

This bottle seems to relate to an earlier group of 'seal-school' bottles now dated to the first half of the 19th century. An article by Clare Lawrence, based on a lecture given at the Vancouver convention of the International Snuff Bottle Society, and to be published in the International Snuff Bottle Society Journal, Summer, 1993, discusses this topic