You are quite correct Christine, the ones I saw were, as you describe, rough based and unmarked, but I have since found examples of some that were labelled, although have not yet been lucky enough to see one with a sun prunt, still got that pleasure to look forward to.
On looking again at the vase, in the full daylight and not in the early hours of the morning(!) I agree it does seem to be either Mtarfa or Phoenician Glass, but without a label, I'm not sure how happy I am to commit to a definite studio.... I will have to leave it to those of you with more experience of Maltese glass than I have.

But I will follow with interest, as I still have so much to learn about Maltese glass.