Edvin Helseth (attrib.) Set of 3 Dining Chairs in Pine Norway 1960s

Nice set of 3 dining chairs, most likely designed by edvin helseth norway 1960s. The chairs are very simular to the chairs with armrests he designed for the trysil-cabin, a norwegian ski resort. These beautiful chairs are made of solid pine wood. They have characteristic details as the flexible backrest, the nicely curved seat and the wood-joints. This model i've never seen before, they might be a proto-type. The chairs are in very good original condition with a lovely patina.