Hi,
I am working on the design of a small layout based in California in the 1930s. Have been doing some research on the Sunkist logo, as my orange packing house will have a Sunkist logo on it. Always thought that it should just be white letters on a blue background, until I bumped into an image of the packing house of the Fallbrook Citrus Association. As you can see, there is colored lining around the white letters. With some further investigation, I found a similar logo, which was found in an old packing house in Upland. Looks like the lining was orange.
Thought this info might be useful to others ...
Cheers,
Jeroen