Goldfinger's Rolls-Royce Phantom III

Auric Goldfinger's Rolls was one of the stars of the film. It was ostensibly armour plated, but Goldfinger replaced the bullet-proof body panels with cast gold replacements in order to smuggle gold out of the UK. The scam was possible because when the book was written there were controls on the gold price in the UK making it artificially cheap here. Prices were much higher in the East and in India. So Goldfinger opened a chain of gold buying shops around the UK buying scrap gold jewellery on the cheap. This would be sent to his HQ in Kent  where is was melted down and converted into replacement body panels for his Rolls, the yellow paintwork was to disguise scratches should it be in a minor bump.

Once at his lair in Switzerland the gold was removed from the car and re-cast into aeroplane seat frames, the plane being flown to India where the gold could be sold at a huge premium.

All this is from the book rather than the movie as it is a bit implausible even for a James Bond film.