I assume that the same colours were used across different designers' work, and almost certainly for long periods of time.
I have a small Poli cylinder vase in an aqua/grey combo (the one I uploaded recently), but I also have a much larger vase in the same colours that I think should be a Pinzoni design (I'm working my way through my boxes of glass with my camera, so I should come to it in a few days).
Also, I've seen the smokey-blue of your piece used in later Seguso wares, ones bearing the post-1976 plastic label, as well as earlier ones with the shield-shaped paper label (on the second water-optic bowl I sold).
One good thing - I've just finished building a full-time photography studio, so I've no excuses for not photographing glass before it gets sold now. My main problem before was the effort of clearing a space to set everything up for every item that I bought. Now I can just plonk it straight on the shooting table.