Vintage Georg Jensen solid silver large mobius brooch - Torun design 374

A vintage sterling silver large mobius brooch - an amorphic open mobius shape pin with a roll clasp fitting to the back - this is the iconic large size no longer in production - marked with post 1945 marks for Georg Jensen of Copenhagen and design number 374 along with Torun for the designer Vivianna Torun Bulow Hube who designed this in 1969 - total weight 51.8grms - overall dimensions 69 x 59mm - c.1975 Denmark