Hi
I have had two very large (10 cm or so) old English paperweights with two or three rings of millefiori set around the same head cane. They were not classic Bacchus, but included some broadly Bacchus style canes. Were they Bacchus? I do not know for certain, but I suspect not. I think the same applies to your paperweight. Unusual, interesting...but probably made using canes that were 'inherited'.
As you know, we do not suggest values on GMB, but I can tell you that my examples sold for less than EURO 200.
Alan