There are two (and probably more than two!) Vincenzo Nason in the history of Murano glass.
Vincenzo Nason (dead in 1948) opened his own company (Vincenzo Nason & C.) in 1934 and produced items with avventurina, blown in moulds, with a technique never used before in Murano, spotted with black, red, blue, or yellow glass.
For this reason I thought and wrote that the "One-kg weight" presspapier that I published in:
http://glass-in-venice.atspace.com/newentries/30-10-04/index.htmlwas made before the second world war, prob. in the 30's.
I'm sure that this presspapier has nothing to do with the Vincenzo Nason who opened the factory in 1967, and surely is not from the 70's (see please the interesting text by Vettore Zaniol "L'avventurina", printed in the catalogue "L'avventurina. L'oro di Murano", 2004, Venezia, pp. 7-35)
Note that sometime in Murano the companies put new paper label on old item
Because of I'm a serious antique dealer, I'm very happy to learn something new concerning this item, this company, and this paper label
Aldo Bova
Galleria Rossella Junck
Venezia