My 1956 John Deere 420 Utility tractor S/N 87974 was painted green when I bought it a few years ago. Upon removing the hood, I have discovered multiple spots of bright red paint underneath the green. The red is in places where it would be difficult to access and in several different locations throughout the tractor. In my experience, John Deere would typically use yellow, not red, as a primer coat of paint. John Deere also had some custom paint jobs for certain customers labelled as CJ codes as per JR Hobbs article in The Green Magazine. According to the Two-cylinder club documents, the tractor was assembled on March 21, 1956, finished on March 22, and shipped on March 23. I would like to return the tractor to its original paint color. Does anyone know if there is any way to prove or document that the tractor was originally painted red?