This armchair was produced by the Czechoslovakian company TON in the 1960s. The beech elements have been cleaned and painted in a walnut and polished with a lacquer. The interior upholstery has been changed and covered with a green colored fabric. 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