I have a bit of googling to add to the obvious, which is that Boselli were primarily a maker of clocks that seemed to do well in the second half of the 20th C. They collaborated with Gio Ponti who was a well known industrial designer.
I also saw a reference to them being an importer of Swiss movements and clocks in the ‘40s at least. Have you looked at the movement?
Brendan can fix porcelain dials IIRC.