Wall-mounted shelf in walnut - 1960s

We too love the String system. It is flexible, versatile, and stable. But when there is just a small piece of an empty wall to fill, we'd prefer this shelf, with its super slim and light side panels and two walnut-faced boards. Easy wall-mounting wih two screws; the two shelves come with grooves on the underside and will sit safely on the ladders. Good general condition with small traces of usage.