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 BĂ©ranek 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!