:clap:
Wonderful piece - Rosenthal is right. They weren't all signed - I have two of these, bought a very long time ago, they are quite scarce, neither of mine are signed. I call these "sweetie jars" - they're nearly the size of the bottles in old-fashioned sweetie shops!
Mine are actually different heights to each other, and the stoppers are not interchangable, which is a shame as I'd like to swap them around - the patterns would match better!
The round polished pontil mark is indicative of the period when both Michael Harris and the Boffos were working there, quite apart from the fact that I do not belive these enormous beast were made after Michael Harris left.
I have seen a couple of these enormous beasts in the Ming pattern too.
"Medina" means "old town". In many cities with Moorish heritage, the old part of the town/city is known as "the Medina".
So the answer is Yes, it's a wonderful early ('67 - '71) piece of Mdina, Michael Harris design, quite possibly made by him. I also would think it might be a little after '67, as it was late '67 when Mdina was set up, getting around to something like this may not have happened immediately!