Lot of 3 vintage folding chairs

Here are 3 folding chairs from the 70s made of chrome tubing and black skai. Very graphic chair in the shape of its tubing and its unusual folding, we see an original label but not readable. Height 80cm, width 53cm, depth 44cm and seat 47cm high. Once folded it is a width 42cm and height 70cm. In good condition, some small traces of uses on the skai (photos 7 and 8 ).