It's a reproduction of a turn of the 19th Century Leaded Glass parlor lamp shade. These tend to date from the late 1960's through the end of the 1980's. Values for them depend on how close they match originals by big name companies such as Tiffany, Chicago, Kimberly and Duffner, etc...
Re: Lamp shade
I’m not an expert but I would call it a Tiffany style lamp shade. If you search for them on eBay you’ll find all kinds of prices. Here’s two examples. https://www.ebay.com/itm/TIFFANY-STYLE-LAMP-SHADE/174478693121?hash=ite…
https://www.ebay.com/itm/Tiffany-style-lamp-VTG-large-18-butterfly-flor…
I’m not sure why there’s such a large price difference but doubt the expensive one will sell for that much.
Re: Lamp shade
It's a reproduction of a turn of the 19th Century Leaded Glass parlor lamp shade. These tend to date from the late 1960's through the end of the 1980's. Values for them depend on how close they match originals by big name companies such as Tiffany, Chicago, Kimberly and Duffner, etc...