Well, partly spotted, anyway. And VERY distinctive:
"The mane is short and completely black; the hooped markings on its legs are completely different to normal ones; it has the shape of a donkey; it is much darker all over, but those spots are incredible."
So says the wildlife photographer who captured it on film. Interestingly, other zebra seem to shun him: he has no herd. Could this be due simply to looking odd, or is it an unrelated circumstance? We don't know.
Nature certainly turns out some oddities.