With less than perfect knowledge, I would like to make the following observations:
Rudolfova Hut moulds were predominantly made 1905- 1950s, by Ulrich and Christl, Mstisov. Only when that company, by then nationalised, became part of Sklarny Inwald, did Rudolfova Hut acquire an "in-house" mould-making capability.
Rosice moulds were mostly made for the factory, prior to 1946, by the Brno based H.Kiko mould-making company, which following the Benes decrees, continued as supplier, becoming Brnoform in the post-communist era, and supplying Rosice when it was, for a limited period, a part of Crystalex.
Libochovice moulds were supplied by both Czechoslovakian companies, tho' three tableware patterns definitely used imported moulds from the USA.
I have no information regarding Hermanova Hut's suppliers.
Raised marks to Inwald items are the exception, not the rule.
Hermanova Hut, Libochovice and Rosice items also carry the mark, but again not on all items. Another pre-war Czechoslovak manufacturer to use the raised mark on pressed glass was S.Reich.
The mark appears not to have been used after WWII.
Regards,
M