What a really lovely find - posh ptherthphtherosomething.
Fern glass to normal folk.
But a particularly wonderful and interesting example.
Is the base of the glass flat? It looks to almost have corners!
Possibly a daft question.
In the first pic, I can see the top of the foot.
Where is the gadget mark? I don't know what to look for. Can you describe the position for me using the clockface convention, pretty please?