Tiffany lamps are treasured collectibles because of their beauty, historical significance and potential worth. Since Louis Comfort Tiffany began producing his signature, stained glass lamps in 1885, many have tried to copy his masterful works. In an effort to ease authentication, Tiffany used four special marking techniques to make identifying his works easier. However, not all originals bear Tiffany markings and later reproductions added forged marks to their products. Learning how to find Tiffany markings will be useful for making an initial assessment; however, an official appraisal is recommended for these art pieces.
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Identify lamps in Tiffany's Favrile group by finding the metal tag on the inside of the shade. Look on the rim and in the metal work that holds the glass. Look for the initials L.C.T or the word "Favrile," "Tiffany Studies N.Y." or "Louis C. Tiffany Favrile."
Examine the bronze base of the lamp for a stamp that reads, "Tiffany," along with a unique model number. Search for the stamp on the bottom or sides of the lamp base or look inside the lamp shade.
Look for an original paper label that reads "Tiffany and Company." Use caution when examining the label as original labels will be very delicate. Find the paper labels on the bottom of the lamp base.