The attribution of weights to 'Bohemia' is a complicated matter, due to central European history! In 1850, Bohemia was part of the Austro-Hungarian empire (as was Venice, and Murano, and Pietro Bigaglia was regarded as 'Austrian' by some). After World War 1 Bohemia, together with parts of Silesia and other territories became the new Czech Republic. So 'Bohemian' paperweights post 1920 were made in the Czech Republic - but not all Czech paperweights were (or are) necessarily made in Bohemia! The large Béranek factory, which shows around 60 different current designs of paperweight on its website, lies within the old Moravia-Silesia territory rather than Bohemia, I believe. So unless you know the precise location of the factory, it is difficult to be sure something was made in Bohemia - even though it may be Czech.
As a result of these geographical complications, I tend to use the attribution 'Czech' rather than 'Bohemian' for post 1920 paperweights from this area!