I have a particular liking to this style/design.
Unfortunately what I've seen in different books that even the so called experts differ on there opinions and attributions.
From my own experiance I would agree with Davids opinion.
The vibrants of the colours I would expect to see in contemporary pieces.
Older examples tend to have thicker glass.
Also the canes themselves tend to more tightly arranged so the width of each cane is less than the example you have.
I am sure that there are older examples out there that would contradict what I have said.
But as a rule of thumb, I look for pieces following my points.
Hope this helps.