Grandmother's kitchen hanging lamp

This lamp hung in my Grandmother Gibson's kitchen in Clarence, N.Y., just outside of Buffalo, N.Y. The family moved from Pittsburgh, P.A. to work for Westinghouse Electric in Buffalo. I wonder if the shade had roots in Pittsburgh?

The family referred to this lamp as the 'Tiffany", which it is not. Who can identify?

Grandmother held large dinners under this shade which hung over a large lazy Suzanne circular table. We loved spinning the lazy Suzanne until items flew off. Luckily, most went horizontal and not vertical! The lamp survives!

The lamp just arrived to my home in Butte, Montana. Hoping to have it up over my kitchen table soon.