This glass pendant light is documented in a catalogue by the company of 'Indoor' this was the importer and dealer of light brands as Vistosi, Venini and Arteluce in The Netherlands. They do not connect this light to a designer or producer in the catalogue of 1967. But most likely it is Italian and by Venini or Vistosi. Both lights are in a very good condition and give beautiful light. The dark blue changes gradually to a light blue.