Thank you, Michael. I'm still oozing a bit myself. 
I haven't seen one before either. It doesn't appear in Jindrich's "Ceskoslovenske sklo DVD database" though his Vizner DVD database offers a drawing of this vase.  The funny thing is that I won it on a Czech auction site for 749czk -- the seller's more common Vizners (toffee, whirlpool, etc.) went for much, much more.  Maybe people didn't recognise it?