Here is a a lovely Sterling silver stylised butterfly brooch made by Erling Christoffersen, who headed the Norway Designs Plus jewellery studio when it was established in 1958. He was also the husband of Anna Greta Eker.
Condition: Excellent, no visible damage, rollover safety clasp
Marks: ND logo, Sterling, EC, Norway, +
Size: 4 cm (1.6 ") across