Available as a single model #9005 from 1983-1988 in Bay, Chestnut and Black. The chestnut color varied from shades of red to a dark brown. The mane and tail are a dark brown. If the mane and tail are black, it could be a variation of the Bay model.
The Bitsy Breyer English Set #1005 included Bitsy Breyer doll, English Tack, and comb from 1983-1987, in Bay, Chestnut and Black.