A MacRumors forum member purchased a used Macbook Air off eBay “as-is” and ended up getting a prototype model of the Macbook Air. The bottom is a black material and there’s no “Macbook Air” written on the screen’s bezel. It also features an interim build of Mac OS X 10.5. The buyer found out that the MBA was produced around May 2007, a whole six months before the Macbook Air’s debut. Wild stuff. I’m not sure if I’d want to own a prototype Mac, though. I have enough problems with my Macbook. Imagine the headache this laptop would give me!