Thanks for your comments... Another little thought is that in HI there were (and are) so many “mixtures” that a hapa haole baby is nothing unusual. I can’t remember reading about the “African” designation - think there may have been discussion about whether this was any kind of standard? I think the tentative conclusion was that race would have been “Negro”, not “African” which is not really an ethnic deignation at all. It’s a bit suspect, unless someone can come up with another [authentic] COLB from that general era that says “African” on it.
But I'll bet in 1961 a hapa popolo hapa hoeli one was highly unusual. Lots of mixes in Hawaii would be more common, probably all of them. Plenty of opportunity for all sorts of exotic hybrids. Caucasian, Japanese, Chinese, Samoan, Filipinos, probably even "Mexican", but not many Blacks in '61, and white/black mix was probably much less common than black with the rest of them.