1926 Speed Six Bentley.
Factory-raced Speed 6s contributed more to the Bentley story than any other model. These specially-prepared models won the 24 Hours of Le Mans as well as the famed Brooklands Double 12. Three of the factory 'works' cars, known as Old Number 1, 2 and 3, garnered most of the acclaim and are currently considered the most desirable of all Bentley models. Original public domain image from Flickr