I dusted off (literally) my microfiche reader to see what was on the microfiche.
It gave lots of details about "Olive Brown" interiors but not exterior colours
I drifted through some old brochures but the best I could find was mentions of "Green", "Yellow", "Pure Yellow" and "Beige" - no colour codes provided
The green and yellow are very pure, bright, primary colours that don't match your picture.
So my best guess is you found "Beige" (code 489 on my web page), which would have a greenish tinge depending on the light and camera settings but look similar to baby poo brown (what "normal" people call mustard) in the wrong light.
Unusual colour choice for a Torry.
Not "Strike Me Pink", "Lone Oranger" or "Barney's Shirt" like the rest of the crowd?
You could always go dark green like on the Recaro Torana Mystere concept car.