In 1956, there were three blues: Regal Blue, Empire Blue, and Crystal Blue (the lightest of the three). There was not a real light blue for trucks, like the Nassau Blue available on the 1956 Sedan Delivery.

The 1956 Truck Data Book that I have does not include the RPO codes for colors and combinations but it has beautiful paint chips for single colors and combinations.

Does anyone have the exterior color RPO codes (and associated color names) for 1956?

Here are the color names and combinations but I do not see the RPO codes.