The link below brings some photos of a P-51 Mustang applied with an experimental paint scheme. Does anyone know the name or if this cammo was used operationally? http://aviacaoemfloripa.blogspot.com.br/2011/01/p-51-mustang-em-camuflagem-exotica.html I count on your visit.
It looks, vaguely, like the paint schemes they painted on some warships back in that era. That doesn't fully explain it on a fighter aircraft though. Strange and interesting. To the best of my recollection, I've never seen a P-51, or for that matter another aircraft from the war, painted exactly like that.
The paint scheme is remanisent of naval patern called "dazzel", but I have not seen this before. Judging from the engine & canopy this was an early version of the plane. In fact, I belive it was pre-fighter. Rather this was a low-level group-support, or a Recon. version of the airframe. The middle picture shows the airplane in a factory. It seems a proto-type. i speculate it was very early production, not even released to the USAAC. The paint pattern, I suggest, was meant to confuse ground observers to make it difficult for them to judge height, course of a single Recce plane.