Definitely Mdina.

And a sort of perfume bottle, or just a small bottle.
Studio glass does not need to have any function or have to be anything.

Stoppers for bottles were sold seperately in the shop earlier on, none fit properly, but yours looks almost like a small paperweight, balanced on top to look like a stopper. Smart use of a pwt!
Normally, stoppers would have a sort of post of glass on the bottom of them. But they do get broken. I've got a few that still sit on the bottle, finishing it off nicely and the lack of a post/stick-bit under it makes no difference.
I'd put this in the mid-'70s-ish to the mid-'80s-ish.