I have not seen Ivo's Portieux post
I have just had a look and the Portieux glass looks thinner than on my two items, the layer casing is 4.5cm thick and ground and polished down on mine, I have had these thin glass copies many times I think.
I still have photos to match up.
I don't see a label just the vases, but I have not ruled out that the paper label on my red piece is an importer label like G Hardy (see the age ware) it may have been put on along with the makers label, even if not the glass is well made and I think 1960s / 70s and by a small if not fantastic company
Importer label as guessed below for the red piece
Hand Made Glass
Of Swedish Origin