Hi,
I do not think this is Czech.
It still looks like really good quality piece of modern studio glass. I hope you can find the maker. The fact it is not very new is good, as this means it is likely by someone identifiable. The scratches on the bottom are usually good news, as they can indicate some age. Please post a picture of the base, it can help identify glass sometimes. An answer here can take many weeks, a nice piece of glass, good luck,
Robert (bOBA)