Adjustable vintage architect or workshop chair from the 1950s

Beautiful vintage workshop chair, from the 1950s. Seat and back covered in original gray-blue skai. Metal structure, probably repainted. Swivel chair, adjustable back and seat (in height & back support) In good condition for its age, small tear on the front of the seat and a small loss on the back adjustment button without impact on operation. The chair goes up and down easily while sitting on it (well-maintained mechanism) Dimensions: Maximum total height: 123 cm Maximum seat height: 83 cm Seat: 38.5 cm X 35 cm. Support diameter: +/- 44 cm.