In terms if design, it's incredibly similar to the iconic 1960s Panton light, albeit without the aluminium construction. This one is made of pine, which is where Hans Agne Jakobsson comes in. But this isn't attributed to him either.
No, this is likely to be a copy of a Panton in pine, with the wood construction giving it something of a midcentury twist as well as a very distinctive look. The seller says this is in 'very good condition' and 'full working order', with just a 'small dent' at the top of one of the slats and a few age related marks.
Doesn't seem to detract from the overall look, but plenty of images on the site for a closer look. If you want it, bidding is at £36 right now (cheaper than the £500+ for a Panton reissue).