I realize this is an old thread, but I am new to the forum and have recently purchased a 1973 T100R and I believe that the orange-red color in one of the previous is the original color of my bike. It was painted a metallic purple on fuel tank, oil tank and left cover. All the info I have read indicates that originally the tank should have been Hi-fire Vermillion/Arctic white and oil tank and left cover black. I have just finished stripping all the paint off everything and the tank appears to have been originally vermillion, but the oil tank and left cover were also vermillion and there is no indication that there is any black paint below the vermillion. It looks like the base paint, or someone did a really good job and stripped black off and then repainted them vermillion. So my question is, is it possible that a bike came from the factory with vermillion paint on the fuel tank, oil tank and left cover? Still have not decided what final color will be. Thanks for any comments.