Bernard, thank you!
Still I am a collector and do not know too much on the history :?
Thanks to D. Mauerhoff I do know that:
all Walther figurines including Pierrot&Pierrette are designs of Fritz Scheiner who joined Walther during the early Thirties. These moulds were used for nearly thirty years, until when Walther collapsed.
I guess that after war most of Walther production was exported to UK.
They would not have exported to Western Germany - that is why it is so rare here. So the Walther glass I do buy now in England is probably of Fifties production but Thirties' pattern.
GDR had their market with the old moulds. New moulds of VEB Sachsenglas never reached that quality.
I do think, Geiselberger and Mauerhoff studied and published a real lot in Pressglas-Korrespondenz - so far all in German language, I'm afraid. But as far as I know they are working on that