I presumed that what Norman was asking was if this piece is Czech glass. I'd fallen into the same habit as Norman, that is, calling all glass produced in communist Czechoslovakia "Sklo Union." Reading Sklo Union by Marcus makes it clear (I think) that Sklo Union only made pressed glass. I agree that, for the sake of accuracy, we should restrict that term to pressed glass. But what should we called the hot worked glass from Skrdlovice, Harrachov and Zelezny Brod, for example? Czech hot glass? (Please, no.) Was there an umbrella term for those factories? Or should we be running a contest to come up with a new name? Is this a new thread, he asked hopefully?