Hi, John.
Thank you for your answer to my question.
I cannot think of another process other than cutting to achieve the round and oval windows, plus would I be able to tell if they were cut after the glass had been through all of it’s processes.
I think you are also correct in naming Fratteli Toso as the maker, there is a similarity to the one on 20th Century Glass.
On the Fratelli Toso guide and gallery there are photo’s of a “ green glass fluted vase with opalescent white vertical ribbing “ there are striking similarities between the two vases.
In my original post I should have added my photo’s don’t do the vase any justice It is very stunning in the correct light and very opalescent.
I look forward to your reply.
Joe.
PS
I will try to take a better photo.