David Coulthard hand signed Race Overalls with Castrol branding, originating from the launch of the Castrol Rankings at the Autosport Show 2010. David Coulthard launched the Castrol Rankings at the Autosport Show, UK in 2010. The ranking system is to show who is the best racing driver in the world, across all the major categories of motorsport. These unused Proban overalls were used as part of the launch of the Castrol Rankings at the show and have been signed by David Coulthard (and one other, believed to be Paul di Resta) are in mint condition and with a COA.