It's a Nazeing shape. I am a bit very concerned about the surface though. It's not Monart Pumice, I have seen and handled that. My brother has a piece and I was with him when we tracked it down.
In the second set of pics, there is a close up and I'm positive i can see a kind of tiny grid pattern with straight lines that look rather like the true crizzled sickness of glass.

But I haven't seen sick crizzled Nazeing before, and it's something I would expect more on glass a lot older than Nazeing.
I'm not at all sure about the ground rim, or the striations surrounding the pontil scar.
I don't expect either of those on Nazeing.
However, the matter of "Scottish glass" getting applied to Nazeing is dodgy sellers attempting to create an Ysart connection. There is no "Scottish Glass" really like this.
It's just another one of those lies that has emerged via a mass of dishonest advertising.
