Hi
My feeling is Italian, particularly in view of the shape, but I would not be 100% certain.
Regarding the Chinese option, IMHO there may not be much to choose quite often between a Chinese and a Murano pedigree, given that Chinese weights have been sold in large numbers over the years in Murano....they are not necessarily in different leagues. Run of the mill weights are run of the mill, whoever makes them! To me, Murano does not necessarily imply quality: they do make / have made many reasonable quality paperweights, but....sadly.....
Alan