My second board after I built one in the early 80's was a used King Cobra and it was a superb board. The triplane tail meant it could gybe really well, and for the time it went upwind well for the funboards of that time. The fairly soft ride was just lovely for the size of the board and it gybed really well. The quirky front sections had a Euro/divII convex (not concave) bow section for light upwind.
Later in that decade a few rich guys got their hands on the Cobra Race which was thicker, straighter, and had parallel sides with forward double concaves that worked really well, a much faster board. I thought they were all made in Thailand. Little did we know that the Thai factory would end up making nearly every sailboard and sup on the water.
Google finds them all, including here.
www.seabreeze.com.au/forums/Windsurfing/General/Cobra-1985-Brochure?page=1