Hello and welcome!
Sorry, I missed this before and sorry you got no responses at all. Very remiss of us!
It does look Maltese of some sort, doesn't it?
It's certainly much later than anything I'm familiar with and I can't be sure it's not Mtarfa or Phoenician.
Is there silver foil in it? I find that confusing!
Mdina did some stuff with gold foil (but still later than my sort of area, really).
You could try sending Mdina an image and asking them if it's their work.