A couple of observations. Ostensibly Barolac was made at Josef Inwald's plant at Dubi bei Teplice. That might explain why this vase came to be fabricated post-1990 at Libs. If Inwald's moulds remained with Sklo Union it is not inconceivable that they were dispersed amongst the four main plants which includes Libochovice.
If we take Weil's Bohemia catalogue, (Thanks Jo) Barolac was being used as a classification term, for sculptural vases from one of the Crystalex factories. Interestingly, vase 586, is an old design, pre-war, an example of which came up at a German auction house in 1998, and was NOT identified as a Barolac piece.
I went back to check what there is on the glass encyclopaedia web-site regarding Barolac and was immediately struck by this phrase:
"The name "Barolac" and the crossed J's trademark, together with most of the designs were contributed by Douglas Jenkins, son of John Jenkins, glass importers in England."
That does not necessarily follow at all. Given that Josef Inwald's registered trade-mark was crossed Js, indeed, is so well associated with Inwald's plant that the crossed Js were used for Sklo Union products from 1965-1978, and revived again in 1991 by Glavunion, again for products from the Teplice site, it is highly unlikely that Douglas Jenkins contributed the trademark. It is more likely to be coincidental that Inwald's mark happens to bear two Js, leading to confusion with John Jenkins.
Again, another question has to be asked why Douglas Jenkins is credited with most of the designs? Certainly, "The Loss of the Revenge", was based on a painting, not by Jenkins, and given the quality of some of the Czechoslovak glass designers of the period, capable of having designed stuff for Barolac, for example Hrosek, Zemek, Lorenz, Hlousek, is it really plausible that Jenkins is the author?