Smokey black is not the same as sooty buckskin. Smokey black is a black horse with the cream gene, and a sooty buckskin is a bay horse with cream and sooty. This is my sooty buckskin (she also has silver, so her points are lightened a bit, and she's also dun... but you can get the idea):
I believe black buckskin is just another term used for smokey black, but it's not a good term. Buckskin is cream on bay, not black, so it's just not right?
Anyhow, according to the registry's webpage
AMERICAN BUCKSKIN REGISTRY ASSOCIATION, INC. ~ Registration the horse's body must be "
some shade of tan, from very light (creme) to very dark (bronze). Points (mane, tail, legs and ear frames) are black or dark brown." So, does he fit that description?