Compare L.H. Selman Ltd., Santa Cruz, 13 October 2000, lots 55 and 56; Also see the article by Albert Christian Revi, Miniature Portraits in Glass Rods, Bulletin of the Paperweight Collector's Association, Inc., June 1958 for a discussion on the collaboration of Giacomo Franchini and Pietro Bagaglia; and See Paul Hollister, The Encyclopedia of Glass Paperweights, New York, 1969, p. 19 and 20, fig. 4 for a similarly dated weight.
It is interesting to note that Bigaglia paperweights were listed in the Austrian section of several of the Great Exhibitions of the day as Venice was still part of Austria-Hungary until it was reunited with the Kingdom of Italy in 1866. The current weight has a central Imperial eagle cane partially bearing the initials FI (for Ferdinand Imperator 1835-48).