Both attributions are incorrect, as is one for this vase, as a Rene Roubicek design.
I cannot explain the iittala label, but clearly this is a Pavel Pánek design for Sklo Union, Heřmanova Hut’, from 1971, pattern number 20218, sizes 165 and 210mm. Only the 165mm variant was exhibited at Gottwaldov in 1972, catalogue number 254. Not illustrated in the catalogue.
It was, however, in both variants, illustrated in the Pavel Pánek retrospective catalogue, published by RMT, 1995, plate no 4.
Unless iittala bought the moulds, (unlikely imho) then this label has been added in error.