Hi - I've seen hundred of finger bowls, but oddly never one with straight sides like this. Unfortunately, an unpolished pontil scar is sometimes there to either deceive or add character, and they can be found all over the C20. My opinion is that this optic moulding isn't all that old.
Always an outside chance that if this piece has the feeling you describe, it might be suffering from surface breakdown, forget offhand what the term is - sometimes the glass can almost weep.
From somewhere in or near the Gulf of Venice perhaps? - but that's a very uneducated guess - and possibly just a decorative item.