Hi Adam. Welcome back on board, as it were.
I've seen 20 or 30 copies of the first vase. Always marked FIDENZA, ITALY; ITALY with a 5-pointed star; or a slightly larger 5-pointed star with FA (I think it is) inside it on the base.
Last time I went to the Cambridge Glass Fair a couple of stalls were selling these as Sklo Union pieces at £20-30 a pop. When I turned them over, both were clearly marked ITALY!
I've never seen a Czech version of this vase, and remain to be convinced that it's a Sklo Union design.
There are quite a lot of Fidenza pieces from the 60s and 70s that appear to be Czech-inspired, but I haven't yet found any direct rip-offs.
Cheers,
Chris