Funny, my buddy has a 500 with a matte burgundy-like tank and black side panels. Does not look like it was ever re-painted. Even the tank looks like it has dulled to a flat looking finish over many years, it was not painted with matte paint at all. He’s had it for about 20 years and honestly it doesn’t look like anything on this bike was ever modified in anyway before he bought it- or after. I always wondered where that color scheme came from too.