Scandinavian Midcentury Easy Chairs "Trienna" by Carl-Axel Acking for NK

Beautiful easy chairs "Trienna" in oak and leather by Carl-Axel Acking for NK (Nordiska Kompaniet), Sweden. Acking designed the chair in 1957, and it was shown at the Triennale in Milan in the same year. It is since then referred to as the "Trienna". It reminds a bit of Børge Mogensen iconic "Spanish Chair", but Acking designed his chair two years earlier.