A form of bay that is usually shown with At, but the gene doesn't exist, instead it now shows up randomly. It is marked by the lack of a complete black leg, instead stopping just above the pastern and leaving some black on the knee joint. 

A red coat with black legs and a black tail 

A more saturated red coat with darker black legs and an equally dark mane and tail 

The darkest shade of bay with a noticeable lightening on the underside of the horse, mostly on the more soft parts of the body. The mane and tail are an equally dark shade of black.