Yes Mark, signed Vizner's piece are rare and all of them are new, even designs are old and "re-freshed". The limited collection was ordered by Alchymie (up to 3-4 hunderds) but when fabricated, contract had been terminated and some pieces sustained in factory. I am lucky buyer of few of them.
Mark, can you please tell me, display or post the overal picture of signed Beranek piece? Meanwhile I was checking Skrdlovice Symposias, seems to me that in 1979 had not been performed. But still exist chance to find the true, Jan Beránek or his son Vlastimil could help.
Jindrich