My very amateur opinion from the sidelines, is that it is from the Ysart stable, but not Monart.
The shade of red is
too orange, the swirls are
too curly and wave like, the shape is
too rounded.
But it might be just my interpretation of colours and the difference between photos and reality.
At first, from the thumbnail, I thought it was
too splodgy, but on enlargement, saw it was wispy too.
So I might be wrong. Best wait for those who know more than I do.

But see the lamp here. P23. That is the correct shape of shade.
https://www.ysartglass.com/Moncat/PageLighting.htm