Here's what I found on my driveshaft. Surface rusty, so confirms bare metal originally. There are vestiges of two stripes side by side, but color is illegible. See pictures below. They just look to be a different rust color than the rest of the shaft. The tape measure shows location from the transition where the shaft necks down at the rear. The width of each stripe is about 5/8" and they are VERY close together. Not sure how they did that on the line, but that's what I'll try to duplicate.
Chuck