Respectfully, just because that is YOUR opinion really does not make it authentically correct for everyone else, does it? During the Model-A production era, Ford manufactured their own engine paint in which there was a M-Spec (-materials specification) generated when it was initially formulated so that all subsequent paint was uniform no matter which batch it was generated from. Just because various reproduction parts vendors have formulated their own shades of green over the years does not necessarily mean their paint is authentically correct. Many unknowing restorers have seen these inaccurate shades of engine green for so long, they erroneously assume they are correct.