Yep Ed that's the 68 Z-28 convertible, one of one, built for Pete Estes. He only drove convertibles and so it was built for him to leverage approval for a true "volume" Z-28 in 68. Supposedly the car is well documented but has not reached some very optimistic price targets at auction. Some info on the car here:
http://www.holisticpage.com/camaro/camaros/rare.htm