JohnTerrell wrote:
As far as I know, all P-51D/K's were manufactured with Olive Drab being used for the anti-glare panels, and nothing else (this can be seen in clear color photos of the earliest variants (P-51D-5-NA's) all the way to the last (P-51K-15-NT's, P-51D-30-NA's, and P-51D-30-NT's)). Unfortunately many photos of the period make the OD paint out to be darker than it really was, leaving some to interpret it to be black in some cases. If there were any P-51D's with black anti-glare panels in WWII, it would have had to have likely been an in-field paint application.
Regarding the propeller, there were the cuffed Hamilton Standard prop blades, which were fitted to the vast majority of the Merlin-engined P-51's during WWII (the prop type that you refer to as the traditional style), and there were also the Aeroproducts prop blades, which were used as the Hamilton Standards couldn't be supplied as fast as Mustangs could be produced. Although identical to the P-51D, those fitted from the factory with the Aeroproducts prop blades were of course designated P-51K's (and had a different nose cone, just for the Aeroproducts blades). There were a number of P-51K's in the 4th FG in WWII, and that is what, without seeing the photos, I would expect them to be. (There was yet another prop type - the cuffless "square tip" Hamilton Standard props - that were introduced very, very late in P-51D production, on P-51D-30-NA's and D-30-NT's. These didn't make it to Europe, though there is at least a small set of photos showing one of these examples in the Pacific, just immediately post VJ-Day).
Would love to see the photos!
NAA blue print for A/C markings for the P-51 show OD for the Anti Glare areas. I glanced through the NAA Weekly Service News that I have that pertain to changes in the P-51D and nothing was noted for a change to Black. Unless there was an company wide directive for all AAC A/C being delivered with black replacing OD but my Weekly Service News are not a complete set.