Thank you for the Polish tip Anik. It is a fascinating piece, I too hope it will have an attribution eventually. Ivo mentioned a few quality factory names, when replying to me via email and said that his small list was not exhaustive but that most cut glass factories of this type usually signed their work. In the list was Rogaska, from Slovenia, a new name for me, I may contact them, but I do not know if they issued unsigned pieces.... Such a distinctive piece ought to have an attribution really! I have contacted Moser but as I suspect it may be lead crystal, I doubt it is their piece, but their historian may recognise it from elsewhere. A guy I know linked to Sypka Czech glass auctions suggested possibly, maybe Moser or Novy Bor, but he, like me had not seen this pattern. This is what makes me wonder if it is not CZ but elsewhere ..... still uncertain, but a thing of quality, wherever it is from!