Three orange Overman chairs 70s

Lot of three scandinavian chairs, design 70, by svente schblom for ikea, edited by overman. They have a bright orange tub-shaped seat. Lucarne at the bottom of the file. Tubular sled sled in chrome steel. The three chairs have wear marks: stripes, chrome stitched, 2 chairs have a "hook" each. See photos. Chairs stamped under the seat.