I'm exceedingly happy to have finally managed to get a definitive answer on this label!
I must thank Davide Salvadore, who very kindly looked into the background of this label for me. For anyone whose not aware, amongst Davide Salvadore's vast experience within the glass industry, he spent some time working for Vincenzo Nason. Whilst, not being able to immediately confirm the origins of the label, Davide, kindly, contacted an old friend of his who previously worked in the sales department of V.N.for many years.To quote Davide Salvadore's kind response to my email
"I was informed by an old friend who worked in the sales department of V.N.for many years(Barbini Gianpaolo) . To confirm that the label was used by V.N. from the early 60's until the late 80, and that N was for Nason .He says that V.N.was founded as a family company Nason , but over the years 80 Vincenzo became the owner,and that was adding the V."
Hoping to be of help.
Thanks to everyone who contributed to this thread and especially Davide Salvadore, who helped confirm the origins of this label!