[Nicholas]

"the two vintage color photos linked to above are photographic confirmation of the US 'Equivalent Colors' scheme of :

ANA 602 Light Grey on the undersides.
ANA 603 Neutral/Sea Gray on the top and sides-base coat.
ANA 613 Olive Drab on the top and sides-disruptive

(notice how the 3rd color is distinctly Brown , not green )"

kurlannaiskos, no they are not. The undersurfaces are very clearly US Substitute Sky, probably patterned to ANA 610 Sky and as required by AMO 864 of 7.9.44. for naval monoplanes operating from ship or shore bases.

The "equivalent" US colour for the AM required Sky was ANA 610 Sky. Why would it be anything else?

If there is any factual, documentary evidence for the application of light grey instead of Sky, contrary to AM, BPC & FAA requirements, please let's see it.