Taking all Bernard's observations on-board, then this is possibly Inwald Zlichov, or Podebrady. As mould blown, rather than pressed, and given the refining shops that existed on all Inwald's factory sites, this is unlikely, due to form, to be press moulded, with post-annealing cutting. Sadly the metal-work, and manufacturer, is less than helpful, as Inwald sold the glass, to be added to by third-party suppliers of fittings, whether brass or silver.
regards,
Marcus