The "Nautilus" model was patented on May 2, 1899 and exhibited that year in London. See Robert Koch, Louis C. Tiffany's Glass-Bronzes-Lamps, Crown Publishers, Inc., New York, 1971, p. 122, fig. 186 for the patent design, No. 30,665, and fig. 187 for an illustration of the lamp; Hugh F. McKean, The "Lost" Treasures of Louis Comfort Tiffany, Doubleday & Company, Inc., New York, 1980, pp. 187-188, fig. 182 for illustration of the model.