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.
![](http://i739.photobucket.com/albums/xx34/minicacj/200764192150_fiat131b1.jpg)
![](http://i739.photobucket.com/albums/xx34/minicacj/167900_184764724877643_6938319_n1.jpg)