Lamps are usually marked:
- with a paper label, "Tiffany & Co.," on the bottom of the base
- with the word "Tiffany" on the bronze base
- with a metal tag inside the shade
- on the rim of the shade with "L.C.T.," "Favrile," "Tiffany Studios," or "Louis C. Tiffany Favrile"
Learn more about Tiffany lamps and their prices at Kovels.com