Nine orange Overman chairs from the 70s

Set of nine Scandinavian chairs, 70s design, by Svante Schöblom for IKEA, produced by Overman. They have a bucket-shaped seat in bright orange. A window at the bottom of the backrest. Tubular sled base in chromed steel. All three chairs show signs of wear: scratches, pitted chrome, 1 chair has a larger "snag". See photos. Chairs are stamped under the seat.