Fiat Giannini

[D-Type]

On Saturday at a collectors fair I bought a lovely little Vitesse model, "Special Edition no VLL 118" of what appears to be a Fiat 500, the 1960's type, not a 'Topolino', and can't place it.

I've googled for all the usual suspects without success and I was wondering if anybody here can help

I don't have a digital camera so will have to describe it:

Model - Fiat 500. But it has Giannini badges front and rear and signwriting/chrome trim on the back left hand corner saying 'Giannini' with '850 NP' below. So maybe a larger engine like a Mini-Cooper
Colour - basically white, right hand side of bonnet is red and white chequers, left hand side is green
Race number - 170
Registration number - 842088 TO - a Torino registration
Sponsors - 'NOVOLAN' in yellow letters front and rear with a circular logo/badge I can't make out alongside. It appears to have a white shape (possibly a map of Monza) on a red background in the centre, black and white chequers at the top, black rectangles each side and the word Monza in white on a black background below.
I have seen a reference to Monza 1968 on one internet site

Any Ideas?