Okay I’ll take your word, but I know “African” was not used. Total B.S.
You don’t have to take my word, you can look at the images of the Nordyke certificates online.
I was a boy of about 7 in 1961, and I was an avid reader of the family encyclopedias (we had both World Book and Britannica), and I seem to recall from reading these that the term of racial classification that was in contrast to Caucasian was Negroid. African was not racial, it was geographical in nuance, and would not likely have been used to describe a parent’s race per se.