Murano dish with label

I understand that the Vetri Murano label can refer to any of the Murano glass makers and that the 048 number refers to a particular factory, but which one?

http://www.ideamurano.it/html/about.htm
it's possibly Idea Murano dave see link above and some numbers on the link below

http://www.muranoglass.com/murano/eng/lista.htm

From reading elsewhere it seems that there are 2 different lists, the Vetro Artistico Murano and the Vetri Murano and the numbers don't tally with each other! so i,m non the wiser