1983 Mondial Argento Color Code / Two Tone

My 89 T has a paint code sticker under the back trunk lid

 

The factory paint sticker should be under the back trunk lid.

Being a 1983, your car would be normally (= if not repainted later in her life) in Glasurit paint, and the name of the color is "Argento 101/C", sometimes also called "Argento Nürburgring 101/C"

As per factory instructions, the "Boxer paint scheme" as initially offered on carbed car was obtained by a first coat of Matt Black paint on the lower body, "20.B.50", then a top coat of matt lacquer "20.T.380" (actually very slightly shiny) over it.
Note that, as it were the instruction for carbed cars, the paint reference are not from Glasurit, which was not the paint provider during the seventies.
I don't have in my records any information about a change of paint references when the factory switched to Glasurit paints.

Rgds

 

Nerofer, there might be a nuance there between the 1983 and 1984 101/C:

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Mine was painted in the lighter Argento with very fine metallic effect, the year after is called Argento Nurburgring and slightly darker/heavier metallic effect from what I saw on samples.