This lamp used to belong to my great grandmother. My family used to say it was a 'Tiffany' though I'm fairly certain it's not as no Tiffany lamps I've seen online look
Tiffany lamps: How to tell real from fake - Antique Trader
The Art of Deception: Tiffany Lamp Forgeries - YouTube
How to Recognize Quality in Tiffany Lamps | Antique Mosaic Glass Lamps | Skinner Inc.
Antique Tiffany Lamps: Guide to Iconic Masterpieces | LoveToKnow
You be the judge: Is this $10,000 Tiffany lamp genuine or a fake? - ABC7 New York
Tiffany Lamp, ca. 1904 | Antiques Roadshow | PBS
Tiffany lamps: How to tell real from fake - Antique Trader