Andy:
I think that the problem with people replying is that there is so much sommerso around these days that it's hard to tell from a photograph whether it's old or modern, Murano, Czech, Chinese or ? The colours don't look Murano to me, but neither do they look like older Czech. I can't say that the pieces in the link look particularly Murano-like to me either, though.
I'd be interested to hear from some of the people who have more expertise in Murano than me.
BTW, I'm not commenting on their quality, just their origin.
David