This zebra drawing was most likely drawn based upon descriptions brought home by the British sailor Andrew Battell and included in The Strange Adventures of Andrew Battell of Leigh, in Angola and the Adjoining Regions. It remains unclear if it is the work of Battell or some unrecognized artist. I’m guessing this drawing is based on notes rather than an actual sighting because the drawing seems a bit too close to a horse to actually be a zebra.
The one caveat I would offer to anyone wanting to use this zebra drawing is that it was from a text originally published by the Hakluyt Society in 1901 and this image comes from a limited reprint in 1967. It is in the public domain in the United States but if you plan on using this image elsewhere, you should double check its copyright status first.
This image is copyright free and in the public domain anywhere that extends copyrights 70 years after death or at least 120 years after publication when the original illustrator is unknown.