No belly marker because the pied takes care of that! It is the traits that are non-typical of the pied that are the clue, like the typical yellowbelly head with the extra orange and the nose stripes fading into the the jaw. Also the couple of saddles that it has are significantly brighter and more orange than a normal pied's. Another interesting feature is that unlike typical pieds he has a completely white lower jaw and underside of his head. (Pieds typically have a grey or normal colored lower jaw.
Those are a few of the things I've noticed...
Justin