
You are most welcome, Jeffingtons - my sincere apologies for not expanding a bit on what I said.

It was getting towards "tine to put the pc off" when your post appeared, but I had to peek!
The colours look far too "flat" for Mdina - they look as if they've been applied to the surface - not worked in in any substantial quantities. The yellow is wrong for it to have been produced by silver salts - and there isn't the variation in shading.
But I don't know what it is. The shape, with the slightly tapered base, is more Mtarfa than Mdina, but I do think we can rule Maltese out.
Have you ever noticed an acetic acidy smell from the glass which feels greasy? That's another giveaway.