VETRERIA DI BORGONOVO S.p.A is located in the town of Borgonovo Val Tidone which according to their own map link at
http://www.borgonovo.it is near Piacenza, towards Milan; nowhere near Florence.
This would tend to confirm what I have long surmised, namely that "Opalina Fiorentina" and it's direct, but rather clumsy translation "Opaline Florence" are descriptions of a type of glass, (not a company, glasshouse, maker) no longer made only in or near the city or Florence.
I don't recall seeing any labelled or documented Carlo Moretti pieces with a pie crust rim. I have a piece in a different decor but equally colorful with this rim which I had ascribed to "Empoli". I do not unfortunately have any confirmed Moretti to compare but I suspect that yours, like mine, is substantially lighter in weight than an equivalent Murano / Moretti piece.
I would be interested to know about the base finish of confirmed Moretti pieces.