Thanks Paul,
given that you're the first person to put a name to the lamp's maker, yes it certainly helps!
I am now trying to find more information about Vistosi in the 1950s, but for someone new to the field like myself, it's not easy.
For example, are you referring to Guglielmo, or perhaps to Gino, or yet another Vistosi?
I would be very grateful if you can find it in you to 'enlighten' a novice...
regards
Kees