"Avorio Safari" -- is my GT4 really 1 of 6?

As I mentioned in my update post, I just got the Ferrari Heritage Original Color Certificate from Ferrari and it listed the GT4 as being actually Avorio Safari 20-Y-546 or Ivory. (It is not Bianco Polo Park white like I had originally thought.)

I have a copy of Autoweek's 1994 Escape Roads piece on a GT4 and it said Avorio is really "rare". When I Googled, I found a car on one of the typical car-specification sites that claims it was one of only six GT4s made in Avorio Safari. (The two others I've seen both had Boxer black contrasting paint.) Also both other Avorio cars were 1975s. Mine, while carrying a chassis number (12500) that should be in mid-1976 has all data (title, data plate, sales records, Ferrari Heritage certificate) pointing to a build date of June 6, 1975.

Anyone have any ideas a) If the one in six is correct? b)If any other Avorios were done without the Boxer scheme? c) If there are any other F-cars (308/328/Mondial/12 cyl cars) that came in this color.

It's so funny, because all I wanted when I was in high school was a red Ferrari, and now I have two F-cars, but both are seemingly extremely rare colors (Blu Medio and Avorio Safari.)