designed by Giorgina Castiglioni and Giorgio Gaviraghi in collaboration with Aldo Lanza, 1970.
                                          Stamped: design G.Castiglioni, G.Gaviraghi, coll. A.Lanza, BILUMEN, made in Italy.
                                          www.designaddict.com helped me to identify  the Designers (thanks!), 

                                          sold

            
              (Giorgina Castiglioni is working as an  architect, designer and artist and received many awards for landscape-  architectural-  and design projects,
              also for the design of complete bathrooms