Here is another photo taken in the same sequence and already the colour has shifted.
I hope these beautiful photos assist modelers in making their own decisions. It sure looks like a variant of U.S. interior green to me. (Testors FS 34151 is a close match to my eye.) Note in the photo below that the exterior colour and the interior colour around the engine are similar, with the exterior colour just being more matte. An aviation research colleague believes the explanation is quite simple: "...the boss of the Curtiss paint shop did not have the grasp of the Norwegian language that he claimed to have. As a result, he got the painting instructions bass-ackward and used exterior paint for the interior and vice versa resulting in a norse of a truly different colour." I'm still trying to figure out if he is pulling my leg or not… However, some modelers are of the opinion that the colour is just Curtiss’s version of Olive Drab or possibly Light Olive Drab 35.
Modeler's Note: While there have been quite a few kits of the Twin Wasp powered P-36 from the likes of Revell, Heller and Monogram, the Wright Cyclone Hawks have not faired as well in 1/72. AML did a short run kit of the type which has a reputation as a difficult build. There is also a family of Hawks from MPM/Special Hobby/Azur, but I have not seen one in person. AZ has just issued a series of Twin Wasp Hawks, so it is hoped they will work their way to the Hawk 75A-8 in the near future.
(Photos courtesy of the Armed Forces Museum of Norway.)