Nobody knows.
The impressed cross mark does refer to this works, (with the v-shape notch in the arm) but we don't know unless there is a label, which is MDG and which is MCG.
In general, I suspect the more sophisticated and complex unique pieces of art glass is MDG, (where they use coloured enamels and silver salts to create colours in the glass; and the more general decorative tourist items are MCG. I also tend to assume if white enamels are used, it is more likely to be MCG.
On the other hand, some of the things which I would still call decorative touristy and are MCG are really quite complicated and sophisticated, eg, the conch shell.