A barn find 1962 Aston Martin DB4 used as a 'test mule' by James Bond special effects designers is to go up for auction at a Bonhams sale on May 22, 2010. The auction is the only one fully dedicated to the Aston Martin brand. The model in question was built for Max Aitken and was purchased in December 1963 by the current vendor. It is estimated to fetch between £40,000-50,000