Not looking at the modelling, (which isn't anything I know about), it is the way the colours are used that make me suspect Boffo. In the early days at Mdina, it would only have been one of the Boffos or M. Harris who was able to get the colours all so swirly and cloudy and looking as good as that.
I would have though too, that perhaps it might have been two makers working on it? Both Boffos or one and somebody else? That might account for the internal colouring and the external modelling being by different hands?
I collect the glassware from MDG, very often the colouring and design are beautifully executed, but Boffo must have been wotrking on it with an apprentice, because the form of the thing can be very lumpy, and have really wonky thick rims, yet the colourway is simply stunning.
There are also pieces which can easily be attributed to Boffo on the grounds of having delicate fine rim flanges as well as glorious colouring.
At MDG, Vicente Boffo was supposed to be training up a load of apprentices from scratch.