This is the CH28 chair, designed in 1952. Though it's made of wood, it's deceptively lounge-y due to Wegner's careful consideration of comfort.
If you are looking to buy a Wegner chair, I recommend trying Hivemodern and Design Within Reach for new chairs, and 1stdibs and eBay for vintage versions.
Also, my colleague Paul Anater has written a fantastic ideabook about Wegner that is chock-full of fun historic information.
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