As someone with some experience of the confusion that importers labels, and some re-sellers labels can cause......
There has been a rash of items, mainly US-based on eBay, which bear a label for the US importer Weil.
Most of those attached to any piece of Czechoslovakian glass bear the legend "Barolac".
This a.m., un-named correspondent, posted me a link to an auction.
Hoffman marked glass, frosted, bearing Weil Barolac label.
This is NOT a Barolac item, the Hoffmann mark tells us so. If pre WWII, Hoffmann would not agree to it being marked with a Barolac label.
IMHO, we are looking at post-WWII production, probably by Jablonecke Sklarny, and exported to the US by Jablonex, not Glassexport. The item is not an Inwald product, so therefore cannot possibly be Barolac.
I am getting rather tired, of the over-heavy reliance on importers labels to prove country of origin, or range. Heppner (London) Limited are one of the few with fairly accurate labels.
Increasingly, as a research issue, importers labels are worthless.
If a documented Hoffmann item turns up labelled as Barolac, then the Inwald attribution is irrelevant. it would never have happened.
Ps, Thanks correspondent.