Two issues,
the piece is not Skrdlovice one, so it mean not Beranek (Emanuel, Bohuslav, Jindrich, Rudolf, Jan, Jiri).
The piece can be Czechoslovak, but I would like to see more pictures to decide.
bOBAs explanation is correct let we say Novy Bor glasswork - it was always the same factory - Borocrystal, Borske sklo, Crystelex only names had been changed. The latest one Crystalex was concern that covered in 80ties also Moser, Podebrady, Svetla, Krasno and Vrbno glassworks.
Just a little notice for Bohemian glass collectors - Novy Bor is Haida.
Jindrich
www.cs-sklo.cz