My New 131 Number 4

[bellamacchina]

The brochure pictures are from a brown car, your car is more red. It is original for sure, I will look if I can find it in a colour card.

[mirafioriman]

I once owned a metallic brown series 3 super. Still have the wings, doors, bonnet and bootlid 

It wasn't my favourite colour I do however really like the red metallic colour

[hammerbeirne]

This is a lovley car

[TC-2000GRY]

The brochure pictures are from a brown car, your car is more red. It is original for sure, I will look if I can find it in a colour card.

THIS COLOR IS NOT AS RARE AS IT MAY SEEM AS I HAVE PERSONALLY COME ACROSS A FEW OF THESE IN THE EIGHTIES. THOUGH I CAN NOT HELP WITH THE PAINT CODE

[131DHOC]

The only metallic colour that looks a little reddish is the "marrone bruciato metallizzato 732", it's a metallic reddish brown and it's not the same as the colour of your car, which is clearly red and not brown.
I own a 131 in this colour and is not the same thing as yours, but it's clearly the same as the old official fiat  pictures you posted:

Are you sure? Metallic red was not an option at his times...

It's the only RHD 131 Super S3 I have ever seen in this colour, it comes up more maroon (red) in the photo's. Its like a maroon/copper colour in reality when you see it, and looks more red in the photo's.

These are the only other photo's of this colour I have.