This swivel desk chair features a brown beech bentwood frame and a rattan seat. The design of this 5501 chair dates from 1866 and is by Thonet. It was shown at the World Exhibition in Paris in 1889. This chair was produced in the 1970s by ZPM Radomsko. The seat can be adjusted in height (45 - 55 cm). I have official proof of authenticity such as vintage catalogs, designer records, or other literature sources and take full responsibility for any authenticity issues arising from misattribution