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Beautiful machine!
That may be a USN PBY but it's certainly not USN camouflage. Looks rather like the Dark Slate Grey/Extra Dark Sea Grey scheme applied to RAF Catalinas.
Strangely enough, only the right side of the the photo was colorized. That's why it seems to be grey I think. Correct me if I am wrong.
Nice WWII shots of a Kingfishers. Note how they had to fold the antenna over. Also note the name on the lower bird.View attachment 513010 View attachment 513011