And here I am with pictures of my labeled 6" (15 cm) long snail. I've seen this shape for Salviati, Cenedese, and now Livio Seguso snails. Livio worked with Salviati in the 1960s before leaving to form his own company. I suspect that Livio is involved in the snails that were made at the three companies -- either that or someone copied the design. I have seen some paperweight birds that were made both at Cenedese and Salviati, so I think there was a link between them c 1970 that involved Livio. What it was, I don't know.
I hope someone can give some information on the label. I assume it is Livio Seguso because of the snail design, but I never trust my assumptions.