When I saw this thread, before any replies were added, my initial thoughts were:
a) Hmm, looks too bright to be 19th century
b) Surely, it couldn't be a modern Chinese version - I think they do make "triple" or "knopped" weights like this?
Alan's first thoughts were along the same lines as mine. Then John's links to the "Weights-n-Things" examples made me think again.
And now I simply don't know!!
When I first became interested in paperweights, I understood from collectors and dealers that "Venetian / Murano" weights were separated by their general "look and feel". Those that were similar in style to "Bigaglia" weights and had a lack of brightness about them, were 19th century and known as "Venetian". Anything that was brighter and had a rather thicker glass coating, or an obvious "dome", were 20th century and known as "Murano".
And I also learned that 19th century examples could be separated into "Bigaglia" (by cane and twist matches to signed examples) and "later 19th century".
Maybe, with the extra knowledge and research of recent times, those generalized separation criteria are not very reliable. But do we really have enough evidence to be sure? I don't know.
The only thing I would add in detail is that the OP's weight and the first one that John linked to seem to have a very similar base finish, which to me looks half "cracked off" and half "fire polished" (hard to tell without close up images).
For elimination purposes, I tried tried to find some examples of modern Chinese examples but even Alibaba is not coming up with the ranges they used to show!!