Yes, Boffo made goblets.
It is known that "Papa" (Vicente) Boffo put the big trails - the massive coloured knops, around the stems of the big early bell-shaped chalices; an MDG labelled goblet the same shape as your Mdina goblet has turned up just this week here; and I have a large chalice with the early bell shaped bowl, minus a big coloured knop, and in the very manner of Earthtones executed by Boffo. I have no way of telling if this chalice is Mdina or MDG - but it is by Vicente Boffo. No marks at all.
However, I was studying the effects in your bowl, the cloudiness isn't typical of Boffo cloudiness - there even seems to be evidence of a mould perhaps being used on your bowl - the way the silver effects are in parallel upright lines? (in the second pic, they are quite clear, although faint)
But one fabby feature seems to be a swathe of clear glass which is amber coloured (from the silver) over the blue - do you get a lovely green colour where this happens, if you look under the right sort of lighting conditions?