Since the MkV is no longer a runner, I should have thought that the title now belongs to Saumur's Schneider, assuming it still does run. The photo of the MkV shows it in the troublesome camo scheme over which we have puzzled in the past, apparently in 1964.
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.