The glass used in this shade is called "Favrile-Fabrique" or "Linenfold", and was cast to imitate the look of pleated fabric. This type of pressed glass was used exclusively for lampshades, and was developed in 1913 by Leslie Nash, a foreman of the Corona Tiffany glasshouse. This shade is amber toned and twelve-sided. Abalone shells are used as decorative elements on both the lamp base and shade. The octagonal-shaped base has two original sockets. The shade and perforated cap are made of gilt bronze, and the lamp is one of two styles produced to coordinate with the Abalone Desk Set pattern. Shade stamped: TIFFANY STUDIOS/NEW YORK/1928. Base stamped: TIFFANY STUDIOS/NEW YORK 604. Height: 15". Diameter of Shade: 10".
Price: Inquire at info@teamantiques.com, or call (914) 686-8147.
References:
Duncan, Alastair. Tiffany Lamps and Metalworks: An Illustrated Reference to Over 2000 Models. Antique Collectors' Club, Suffolk. p.192, fig.747.
Eidelberg, Martin & McClelland, Nancy. Behind the Scenes of Tiffany Glassmaking. St.Martins Press, NY. 2001. p.94.
Koch, Robert. Louis C. Tiffany: The Collected Works of Robert Koch. Schiffer Publishing Ltd., PA. 2001. pps.171, 270 (figure 57).
Holland, William. Tiffany Desk Sets. Schiffer Publishing Ltd., PA. 2008. p.114.