I would like to answer to "blueoctopus",... I know I found some information on web glass site about Dino Martens very funny and not true .
But I believe to a real Murano Italian old glass man born in 1929 (che ha conosciuto direttamente di persona Dino Martens)
[Mod: English - who met Dino Martens directly in person] so for direct knowing : Dino Martens started to work in SALIR (ditta di Murano che realizzava incisioni su vetro)
[Mod: - English: Murano company that made glass engravings] after about 1935 he was use to work in AVEM until the war 1939.
After he worked for Aureliano Toso ( but was really friends of Ferro brothers so always keep with them a sort of collaboration ). Bizantino glass vase etc are made in AVEM furnace

(sorry for the strange english )