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?