Thanks Greg. I may send them an email. Apologies for the diversion on your thread.
In the meantime I'd forgotten about Andy's information on this thread where he believes his version might be from Arte Nuova Murano:
https://www.glassmessages.com/index.php/topic,41541.msg265637.html#msg265637Looking that up and re-reading in reference to my vase, 20th Century Glass has this information on it:
https://www.20thcenturyglass.com/glass_encyclopedia/murano_glass/artenuova_glass/It states the designers involved may include:
Itamo Pustetto, Licio Zanetti, Mario Fuga, Aldo Fuga, Nino D'Este, and Alessandro Lenarda.
So no Ferro and Lazzarini.
To be honest I can't see anything on net searches that links mine to Arte Nuova Murano.
Therefore I think it is definitely worth and email and thank you so much.
m