Also referred to as 'Flag Blue', FS15044. Very dark blue and easily confused with black at first glance.
Commander-in-Chief's US Fleet Pacific and Atlantic personal OS2U-1 Kingfisher's were painted in this overall scheme during 1940 except floats and empennage which were aluminium paint.
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In the 1930s several aircraft were painted with "Admiral Blue" paint, a paint noted in many documents but not identified in any color charts found to date. From B&W photos we know the blue was very dark, and rumors note the color derived from the paint used on flag officers' barges - can this be what we're seeing here?
Cheers,
Dana