Rare set of 4 rattan armchairs, midcentury design, 1960s

Beautiful and rare set of 4 midcentury design armchairs, dining chairs. I have never seen this design before which is especially remarkable because of its double tubular chromed steel armrests partly covered with rattan. Chairs are probably Italian or Dutch design.  Chairs are very solid and comfortable. The set is in a good, vintage condition. See all images to get a good impression.

Height backrest 81 cm, seat 46 cm, armrestst 67,5 cm
Width 56 cm
Depth 53 cm