I have just bought a nice bottle at an auction, whose catalogue described it as "Venini, mid 50s, design Fulvio Bianconi".
Height is almost 17", red and emerald green strips, and it is acid etched on the bottom with a round "Venini Murano" mark, BUT....
...there a couple of "BUT":
1) The pontil is unpolished, whereas on all the Venini production it is supposed to be smooth polished from the 30s, at least.
2) Although colours and design are very Venini, I can't detect the very model on the old Venini catalogues.
Here is a pic of the bottle:http://i7.photobucket.com/albums/y288/valdemar66/veninibottle003.jpgmod: large image converted to link