Please see this coin page: https://en.numista.com/catalogue/pieces831.html
I don't believe that the 1990 coin listed here exists. I have one of the mint sets and it has the P. W. Botha coin KM# 148. As far as I am aware, this is the only version of the mint set that came out that year.
The 1990 version of the coin is, likewise, not listed Cliff van Rensberg's contemporary South African catalogue, or in Krause. Finally, nobody has one. I'm certain that this line has been added in error. Please could we consider removing it?
Supporting images to be found below.
Cheers!
Andrew
