Industrial vintage Tubax chair, more available

Description
1950's Tubax chairs attributed to Willy Van Der Meeren, Belgium.
I have a total of 9 pieces
Thick grey tubular metal frame with the original blue skai upholstery ( some small restaurations, spots and discoloration, see latest 4 pictures)
Good used vintage condition with some signs of rust on the frame and there are 2 chairs with some lose springs ( see latest picture)
Under the seat is a wooden board with holes to let the air out.
Unique industrial look of the 50s
Size: 46cm seatH 82cm total H Seat is 40 x 40 cm