From the Reise der österreichischen Fregatte Novara [...] Zoologischer Theil, J. Zelebor, "Säugetiere":

"An old male of this delicate and distinct species had brown irises. Total body length 2‘ 10’. Height at withers 18 ½’, at the cross 19. The old male is not uncommon on the Constantia moors and is hunted and killed almost daily by Dutchmen with well-trained horses. Many are also caught in traps.
Location: Cape of Good Hope. An old male, an old female and a young animal" (p. 35)