i might add they are the largest production facility within the Zwiesel group; one of the megaproducers of household glass in Europe.
The top three:
ARC of Arques, France (Arcoroc, Arcopal, Arcuisine, Durand & others)
Bormioli Rocco of Parma, Italy (Various brands including Duralex)
Zwiesel, of Zwiesel, Germany (including Pasabahce)