Unless you're building a model for a builder's photo any combination and variation on a similar of close color ought to be good for our models. Paint, especially back then, had wider color range than what we have today. 

       Good point, Roger. I recall the retired PFE Chief Mechanical Officer telling me about the PFE representatives at manufacturing plants, who had to decide, on the basis of color drift panels in their possession, if a paint being applied by a builder was "close enough" to the color drift. They had to use their judgement because there were always variations from any paint company.