A very similar/exact shape to some early Mdina Ming globe vases, so could have been made there, but it's the Boffo way of executing Earthtones. I've got 2, one has a fully polished flat base, the other a fully polished flat base with a roughly ground out round pontil mark.
The only way of being sure is if there's a label or cross prunt, but assumptions can be drawn from considering the different base finishes. Not too many - given the randomness of how things were finished off at Mdina!
However, round ground out pontil marks at Mdina tended to get fully polished.