A very interesting piece, Michael! I've got the same design, only in solid 'citrin'. Sadly, Jindrich says we've still got too little information to know, in all certainty, who the designer was.
At the antiques market, I saw a ZBS vase with the same label as yours -- the body of the vase (which looked like an elongated donut with a hole in the middle) was yellow, and the foot (like that of a wine glass, only much shorter) was pink. I decided it was too 'loud' for my taste and left it behind, even though it was labeled. :usd:
I do like your vase though.