Aston Martin History - Aston Martin DB4 GT - The Aston Martin DB4 GT Zagato was introduced in October 1960 at the London Motor Show. It was effectively a DB4 GT, lightened and improved by the Zagato factory in Italy, by Ercole Spada. Initially the factory had plans to produce 25 cars, but demand wasn't as strong as expected and production ceased at the 20th unit. Nowadays, due to the rarity and popularity of the DB4 GT Zagato, the cars are worth a considerable amount of money, and at auction they reach well in excess of £1 million.