Good honest original Czech swivel chair with a simple splayed base. The frame is heavy weight steel and the seat and back are laminated formed birch. The seat has a simple height adjustment screw and the seat height can adjust from 47 to 59cm.The back has a simple sprung action. This piece is attributed to the mentioned designer/maker. It has no attribution mark and no official proof of authenticity, however it is well documented in design history. I take full responsibility for any authenticity issues arising from misattribution