This Prague or 811 chair was designed by the Austrian Josef Hoffmann, who designed the chair for Thonet in the 1920s. Timeless design: the chair was popular in both the 30s and the 50s/60s and is again very popular today. This chair was produced in the 1970s by Ligna (former Thonet factory in Czechoslovakia that was nationalized after World War II). Marked. This piece has an attribution mark, I am sure that it is completely authentic and take full responsibility for any authenticity issues arising from misattribution