Rare model bentwood chair, J&J Kohn for Thonet (Mundus),1st half 20th century

Beautiful bentwood chair from the first half 20th century. Makers mark not visible but must be  J&J Kohnfor Thonet (Mundus). Characteristic is the bent backrest which are armrests at the same time. Great wood work on its seat and back. In a good and stable condition with signs of usage matching its age…see images