Just kidding. But some definite design similarities with this beautiful Smith-Corona Skyriter weighing in at just 7lbs! (With the case, it is just 2.75" thick.) I believe this model is from the late-fifties. It's listed on ebay with just 4 hours to go, but already at $230+ dollars, this one shan't be mine. More on Smith-Coronas here and here.
(p.s. I love my Macbook Air!)