That's a sweet looking wagon! I think the lighter color in the spear is Desert Sand. The dark color of the rest of the car looks like Canyon Tan, which is on sheet 1 of the 1955 color chart (I'll link instead of post because it's also a big image)
http://pc.dupont.com/hcl/search/imageViewer.jsp?imgurl=/hcl/data/Data/Domestic%20Cars/Chrysler/Chrysler%201951-1961/CHR%201955/000386.jpgHere's a 1955 300 that's all Desert Sand:

That being said, with the change over to the rosewood boards and plastic pickguards, the color of the Duo Sonics changed over time to a darker color.

So, assuming that Fender continued to source Chrysler colors that were one or two years old, here are some possibilities for the RW board Duos. To me, Mesa Tan looks the most likely, but Desert Beige has the pinkish hue. If Fender was using surplus paint as it was available, it's possible all of these were used at some point.
