ndustrial chair by Thur-op-seat Vintage chair with an industrial design. The design can be traced back to the famous Pyramide chair by Wim Rietveld. The chair has a brown metal frame, chair is marked at the back: Thur-op-seat. The chair is in a reasonable condition given the age, there are some small visible signs of use (see detail picture's). The size is 79,5 cm high, 46,5 cm height and 54 cm wide.