It seems like the majority of Commandos are black - at least the ones I see.
Even my bike was black when I got it, and I decided to paint it whatever color was first on the tank/sidecovers.
As I stripped it, it went black, red, black, red, black, black, red. The color it is now is a match from a silver dollar-size chip I was able to scrape off the tank. I am happy with the color, even though I now think the tank and sidecovers were from a much earlier bike, as the color is more signal red than Candy Apple (and the first tank and sidecovers are glass, not metal).
The metalflake on that fastback is truly amazing. I wouldn't change a thing.
I wonder how many are still that color?