I did finally find this:
"sometimes bearing labels which read "Arte Nuova Murano, Grand Prize, Genuine Venetian Glass, World Fair Brussels 1958". Other examples have a label which reads "Arte Nuova Murano, Pustetto & Zanetti, Made in Italy". The factory was open only for a relatively short time, from 1954 to 1965."
No source this data. Just adding to help in documenting this maker...