A quote from Klein's study

"It must be concluded that the present study has not clarified the specific identity of the Glasgow skull, though on the basis of characteristics which are not considered here, but which may be seen in Mohr's photographs, I think it is highly likely the Glasgow specimen belongs to H. niger. This conclusion has been reached independently by Gentry."

Alone amongst the specimens that he reviewed, Klein had not handled this one in person.

Reference: Klein, RG. (1974) ‘On the taxonomic status, distribution and ecology of the Blue Antelope, Hippotragus leucophaeus (Pallas, 1766)’, Annals of the South African Museum’ 65(4): 99-115.