720's were actually what I call "silver".  It looks like grey in photos, but it has a metallic look to it and the color changes a bit depending on the angle you look at it.  Most of them I've seen have been repainted a plain grey though.  I have one in line to restore, but I really don't know what I'm going to do to match that color.  I wanted to just laminate it gray but since discovering it is metallic, I haven't been able to find a match.
Wade