The generic (unmarked, plain white boxes) I get from Don Mar is almost always 2.0 mm thick (up to 32 x 40). Larger sheets are, I believe, 2.5 mm.
My understanding (and, sorry, I cannot remember the source) is that this “vanilla” glass distributed by Don Mar is manufactured and boxed in Belgium.
I love the stuff ‘cause is 20% thinner and, therefore, 20% <strike>lighter</strike> less heavy.
I don’t find any more flaws in this generic glass than I do with TruVue.