Dan K wrote:
Not being much of a Mustang expert, I found the following interesting concerning AG345 (second photo), borrowed (without shame or permission) from Joe Baugher's site:
Since the NA-73X had encountered very few problems during tests, production for the RAF began almost immediately. The first production Mustang I for the RAF (AG345) flew for the first time on April 23, 1941, well behind the original schedule. It was retained by NAA as a development machine, and was used in an extensive series of tests to iron out bugs and eliminate problems. Perhaps the most noticeable change was the extension of the carburetor inlet right up to the nose in order to give good ram recovery at extended angles of attack. This machine was initially unpainted, but it later got an RAF paint job with camouflage, but it remained at Inglewood and did not ever get any guns.
make that photos #2, 3, 5, 6 & 7
and speaking about color:
Martin