Documentation of the career of Jindrich Beranek is not well documented or widely understood across the world of glass collectors. Research about Skrdlovice is still emerging. Since you live in the country where, although of Czech origin, he spent most of his career, you may be better placed to contact local glass collectors to find out more, than I am in the UK. It is the fact he his glassmaking not been covered in detail in books etc.. coupled with the fact that his cousin Jan at Skrdlovice was hidden working inside of a communist run state for most of his life (and that glassmasters did not do a lot of glass signing in that country during that time, even if they often designed as well as blew glass which was unusual) means that documented signed pieces of both have often been confused and the value of Jan beranek pieces means there has probably been an "optimistic" tendancy to interpret J. beranek signatures as Jindrich ones. The whole picture is still yet to emerge and researching the career of Jindrich Beranek would be a useful and interesting exercise since he did work and train as a young man with his relative, the legendary founder of Skrdlovice (father of Jan) Emanuel.... I have read documents I cannot trace, that Jindrich some time during the 1970's, was contracted to produce quite a bit of glass for Lobmeyr, possibly when he produced the lovely replicas of Emanuel Beranek Skrdlovice 1950's small round vases. I am aware that a couple are being sold as such on ebay.de but I have read elsewhere in some catalogue that he did produce for Lobmeyr.
I hope your enthusiastic collecting continues, it is interesting glass!