I looked at what I'm told used to be a 870 Black Knight. But the original owner had it painted Desert Sunset & Flambeau Red because he didn't like the colors of the Black Knight. The second owner has it for sale & told me this story. It was is in a fairly dark shed & the only light I had was the flashlight on my smart phone. I ran the serial # & it is a 1971. Correct me if I'm wrong but weren't Black Knights 1971 & Golden Demonstrators 1972. Maybe I found something. I'm going to go back with more light & see if I can find any signs of Black up under the hood or on the inside of the fenders. It started right up & sounded great & I couldn't find a oil leak on it anywhere. Just to much junk in front of the door to back it outside to get a good look. I'm keeping my fingers crossed.