Sue and Robert: quite right! I wouldn't be putting Baccarat money down on something on the strength of a similarity. I merely spotted a similar design trope and suggested a rather optimistic avenue to be explored in answer to 'any ideas on where i might start to look???'
I think that's reasonable. i just happen to be in the middle of some semi-causal research into late 20th century modernism and Sottsass is one of my interests as he was one of the leading designers of Postmodern domestic items, especially through his involvement with Alessi. Much of his later work was historicist in nature, drawing elements from earlier styles and periods, so the similarity between the bowl and the Baccarat vase are due to Sottsass's copying or elements of earlier designs, rather than them having some contemporary relationship.
(I hope that makes sense; I haven't had coffee yet!)
All I personally can say about the bowl for certain is that it's not American, and that it's either a great piece by a good company or a good piece by a great company.