My post was general information only, Wolfie.

I'm saying the same prunt
mark was used - or at least one that that was the same shape

at
both Phoenician and MDG.
I'm not saying this bottle is not MDG, of course it is.

It's the same tool that is pushed into the bases of bits of MDG that is pushed into the blobs of glass put on the surface to make a blobby prunt mark.
The tool used at Mdina had a completely different shape on it, the cross consisting of 4 triangles, with spaces inbetween.
The tool used at MDG had a cross with v-notches in the arms, and a round shape in the centre.
The tool used at Phoenician had a cross with v-notches in the arms and a round shape in the centre.
I've only recently found an old bit of Phoenician and made this observation - when I was looking for something else.
Patrick showing the mark reminded me I needed to pass this snippet on.