I remember posting this before, but very indirectly, and wasn't asking for answers then.
Back in 2007 there was this thread........
http://www.glassmessages.com/index.php/topic,10674.msg82591.html#msg82591 .. which, apart from mine, appears to be the only other mention of the trademark DURIT that I can find. In this 2007 discussion, Frank Andrews mentions Vitrea (Merchants) Ltd. in the same breath as DURIT, and I assumed the implication was that this trademark had a Czechoslovakian connection, but now I'm very unsure - the name DURIT isn't shown in the index of Marcus Newhall's 'Sklo Union' book.
Does anyone know if DURIT was a Czechoslovakian produced material, and perhaps the period of production. This tumbler appears similar to CRYSTOLAC insofar as it looks to have a dot code, indicating (presumably) a specific production year.
Thanks for looking
