Thanks Gab,
Yes, that is the brochure with the 'Mexico' vase, it is exactly the same as my vase. The picture is quite small, but when I enlarge it I see the same star on the base.
I don't see any markings there, not even a small embossed B. I also looked at all facets of the surface, but no. You can see at the outer edge of the star, that the side surface shows a lot of shrinkage, the glass is very thick there. The glass is also yellowish !
Coincidentally, I also have the other vase the “Cleo”. It is embossed 'Made in Italy’ in the base edge, and it is made of clear glass !
You can see in the brochure ( ‘60s '80s) that there are 2 completely different styles, Art Deco and Modernist... but probably both in clear glass? Could this vase be from their early fifties period ?
I have 3 more vases with the same pattern, but with slightly different proportions. 2 are made of yellowish glass and 1 is clear, they have concave bases without the star, all 3 are also unmarked.
I knew about Fidenza, but I was not aware that Borgonovo probably also bought or borrowed designs from other factories ?
Kees