Hi again, I have searched Brockwitz and Walther, and don't see any like this in such a nice set of 12 in a lined box.
I am sure you are right Ivo that they are pressed glass and the design certainly does echo the 20's and 30's, so we must keep looking.
Perhaps you could take a couple of clearer pictures on a larger scale russilonious, as Anne suggested, so that we can help you more. Pictures of the box top, base and any internal views without the coasters inside might help as well.
At the moment I can find nothing at all like this, and I am really interested.