Magic Crystal was a product of Hofbauer Crystal c1951-c1991 name was taken over by Nachtmann who continued to produce various sculptural items in the MC range. Except Hofbauer Crystal appears to be a trade mark of Anne Hütte Bleikristall, Windischeschebbach, Bavaria who folded in 1992 which ties up with 1991 closure. From 1994 Concorde Kristallglas GmbH were in their old address and presumably continuing Anne Hütte brand, despite Nachtmann having some tmś... well it gets confusing...
Maybe move to German glass for some unravelling, you could contact Nachtmann. Not supposed to be good on answers but if you can locate division which does design http://www.nachtmann.com/en/b2b/
they might own up to this piece.
As to the Hofbauer name, well address of Annahütte was Hermann-Hofbauer-Strasse 6.