 The manufacturer let it be known that Bertone had been involved in the styling of the Polo and its Audi sibling, although the car was essentially an in-house Audi design, with the Italian design studio's contribution restricted to the circular extractor vent cover at the base of the C pillar, and the small "flick-up" at the rear end of the waist line.The Polo was manufactured at the Volkswagen plant in Wolfsburg.In 1977, the Derby sedan was released, which was simply a Polo, identical to the hatchback from the C-pillar forward, with a large boot attached (an old Audi proposal, but never sold by this brand).