Hi there,
I have never come across this label before and although I looked around, I could not find it anywhere either.
It may help your search to know that in my opinion, the paperweight is from Murano. Have a look at the Italy and Murano glass discussion on the board as there is a thread specially devoted to labels. May be you will find an answer there.
If this fails, you could have the moderator move this query (after a little while) to the Italy and Murano glass discussion, to take a look at your label. They may have come across it on another glass item.
SophieB