Vintage rolled gold Art Nouveau style abstract modernist design panel collar necklace, 29 grams

Lovely vintage rolled gold panel necklace with a lovely abstract with Art Nouveau / Arts & Crafts style design. Pieces like this in rolled gold were often made by German makers such as Andreas Daub (AD) or Kordes and Lichtenfels (K&L) for example. However, this one has the stamps 'Orella' and 'Metall' which I have not yet been able to identify.

The necklace fastens with spring ring clasp and its length is about 17 inches. It is in very good vintage condition, with lovely shiny rolled gold surfaces. It is nice and weighty and weighs 29 grams overall.