The present example, depicting a mid-19th century Baccarat butterfly in profile with folded wings, is one of three known. An example perched on a purple budding stem can be reviewed in Paul Jokelson's, One Hundred of the most important Paperweights, London, 1955, p. 46-47, plate 17. At the time of publication this example was considered unique. Formerly part of the Rubloff Collection, this weight is now conserved at The Art Institute of Chicago (inv. 1997.845), and illustrated by Geraldine J. Casper, Glass Paperweights, (The Art Institute of Chicago, 1991), p. 47 and 110, cat. no. 17. The only other example extant was documented in 1998 and illustrated as the catalogue front cover, when Sotheby's offered 'Important paperweights from a Private Collection', New York, 29 April 1998, lot 136. This weight is a close comparison, the most self-evident variations being the placement of the leaves and smaller size.