Clearly there are diverse opinions on this issue.
I think that it was Adam A, who suggested in another thread that Blanka Ademsova, had not personally made a piece of glass, the inference perhaps being given that some-else did the work, and she took the credit. In part, that may be an erroneous perception drawn from a comment from the late and much respected Robert Truitt, that (to paraphrase" few czechoslovakian artists made the glass").
That quite clearly is erroneous, Suhajek, Fisar and Jezek, always clearly as cognisant of the skills, and capable of exhibiting them, as any glass-master assisting should be.
To talk of Ademsova, Novak jnr, etc, is to talk of a training, bearing little relation to western perception. Virtually any candidate to VSUP, was already, by virtue of their training at the glass-schools of Kamenicky Senov, Novy Bor, or Zelezny Brod, a highly skilled and trained artisan.
Thus whether later they chose to design only, or interact in the creation of the piece, many had skills far beyond most western artists.
I suspect, though no doubt I am probably wrong, that Jasper Conran, or John Rocha, have had little or no training, in what is a complex material to work with. I suspect that designs have merely been passed to the glass-masters.
Thus any glass bearing such a tag /acid-etched mark, sand-blast motif, has what, if any, value?
It is no indicator of anything, beyond an un-acknowledged glass-masters ability to produce an item, bearing a desirable name.
Once the plastic or paper label has disappeared, does it matter?
A glass-master may be able to say.....