Analysis of information sources in references of the Wikipedia article "Seal brown (horse)" in English language version.
Dark Bay/Brown: The entire coat of the horse will vary from a brown, with areas of tan on the shoulders, head and flanks, to a dark brown, with tan areas seen only in the flanks and/or muzzle. The mane, tail and lower portion of the legs are always black, unless white markings are present.
BROWN: The Brown horse's body color is black except for lighter brown areas around the muzzle, eyes, flanks, and insides of the legs.