Had a brand new 750 red one in 1972, red with a slight flake in the paint, no black paint anywhere on the bike.
The talk was the red ones went fastest as Honda built the bikes in a red line, a blue line and a gold line, and the red line built faster 750s.
Would wind it up to a genuine 135 mph, layed flat out on the tank. Between Hawker and Quorn in the South Australian desert.