[Brad54]

What color was the factory primer on our '60-66 trucks?
I'm getting ready to start a '62 K-10 long-step project, and while it'll be a frame-off rebuild, it's not going to be concours... and in fact, I plan on using the truck. I've got some out-of-the-way hunting and fishing places, and it's going to see a construction site or two as well. It's also going to have the factory tailgate chains, and even with rubber tubing over them, they'll scuff the paint badly and the hook holes will grow rust.
I'm planning on single-state dark blue (factory color), but even so, scratching that up is going to kill me... so I'm going to "patina" the truck (good Lord I hate that...) and half-buff through the paint on the high-contact areas and tops of surfaces.
So, what'd the factory use? Red oxide or black primer?