Hello and welcome to the board.

What a lovely thing!
What I am wondering is, if the lampshades and the setting originally belong to each other or if somebody has bought, or had made, suitable new shades to add to an old fitting.
They are lovely shades, but could be quite new.
This happens a lot.

Glass does move around the world a lot, but looking for a maker close to you geographically, might help.
Are there any markings on the stand/base itself?