We have a winner!
Robert is right -- Jindra Beranek it is.
And probably the best piece I have ever seen from him.
Son of Emanuel Beranek, he designed for Skrdlovice in the 1950s, and escaped to Austria in the 1960s to found his own glass studio. For those who are not familiar with his work (and for collectors outside of Austria it is quite impossible to come across one of his pieces) here is some more info: http://www.glassmessages.com/index.php/topic,38105.0.html
Another great piece by him on the Fischer auction site: >> Link
And I found >> this ebay auction
of a quite common design by him, strongly influenced by 1950s Skrdlovice.
It shows a very interesting "certificate" (I will translate it later for the non German speakers)
Pic of the signature attatched.
And some of his other pieces in my collection.
Thanks for taking part!