I have asked to a friend of mine who sold so many "scavo" glassworks in the past. He was very specialized in this kind of product.
These the info I have:
First of all there were not so may producers in the last 10-15 years. THis at least officially, due to of pollution laws more stricht than in the past and very hard to be respected in old factories. May be somebody else produced them, but in a kind of "unformal" way (it means without to respect the anti-pollution rules and without to declare this production).
The main name is Rossi, who was not located in Murano, but in Venice historical center (! very strange !).
Than Luciano Gambaro, still producing in Murano.
Also Barbini had a more commercial (and cheaper) line approx 10 years ago; I bought some pieces from this company in 1999-2000.
So, on one of them can be "compatible" with this signature.
Therefore I have to came back to the first name of Zane (it really looks as Zane)....
Ciao
Alex
www.artofvenice.com