It is Emanuel Beranek 1959, PN 59124. A lovely piece. The Jaroslav Svoboda vase is also very nice, I think in the largest size too. A significant series of vases for him during his time at Skrdlovice, as you probably know, he used frequently used cobalt blue to dramatic effect and still does today at his Svoboda Karlov glassworks. I hope you find some more Skrdlovice on your travels!