Some 1950s/early 1960s pieces added:
1. I was looking for this one for quite a while: lovely Stahlikova/Veliskova beaked vase, opaque white inner casing, surrounded by a black band. PN 6005, 28.5 cm high.
2. big bowl by Emanuel Beranek, appr. 36 cm wide. PN 59108. Marvelously executed -- massive base, paper thin rim, totally underestimated pieces imho. (unfortunately not easy to photograph).
3. mystery piece: curvaceous bowl, 20 cm wide. It just has to be Skrdlovice. The closest I could find (not a perfect match though) is a design by Marie Stahlikova, PN 5623.
Again in the scarce yellowish opalescent colour, this time with a light rose-brown inner casing. No iridescence.