Following on from yesterday's surprise (to me) that my Ekenas bowl is actually Mdina, I googled away and kept finding pics of a range of bowls by Mtarfa that appeared to solve a longstanding puzzle for me.
I bought this strange little bowl many years ago. It has never seemed to me to fit into the output of any European country I considered, but I failed to consider Malta. Hope I'm right. Second pic is over-exposed, but you should be able to see the colourless outer casing.