I can see why you might think so, but I agree with John, it's not Mdina.
The bubbles are completely wrong, the broken pontil scar and roughly ground surround would never be found on a piece with a "frilly" lobed edge.
I've never seen a broken pontil scar in conjunction with a roughly ground circle from Mdina, but would not rule it out as a possibility, but it would only ever be seen on a very early experimental piece, which, I believe rules out a frilly, lobed edge.