As far as the glass finish goes (satin, glossy, etc.), that isn't usually relevant when trying to discover a hot glass technique, but there are exceptions and this might be one of them. The finish might hold clues for attribution, though, so it's good you paid attention to it when looking around.
Threading can create a raised pattern, but it can't create a sunken one except insofar as the surrounding glass may look like a groove has been created to accomodate the thread. But the outer surface of the threading won't be below the surface of the rest of the glass.
As to attribution or origin, I'm pretty clueless there, not having seen other examples of this (that I remember). The inkwell that's like yours seems to me to be an Italian shape, but that doesn't mean it was made there. I've never seen any Czech/Bohemian glass with this sort of treatment, but maybe Ivo has.
Have you figured out posting photos? It might be helpful to see the bottom and a couple interior shots, including one of the lid.