original bed color?

[70Custom10Nut]

My LWB 70 has the original wood in the bed, and for being almost 40 years old, is in pretty good shape. My question for all is: What color (if any) was the original finish on these? The reason I ask is I power washed the surface to start prepping it for refinishing (I'm going to sand/seal it with Thompson's water sealer to get a few more years out it before I replace it), and there is body colored paint on the wood. Most likely it come from a sloppy repaint that was done long before I became it's keeper, but nothing is out of the realm of possibilities. I learned to drive in my Dad's 67 GMC 1/2 ton,(back in '75, 11 years old, oh those were the days) but it had a steel bed, so don't know. Can anyone remember? Cnut