Here are three photos of a new old stock manual wiper that was purchased in the original blue and white Ford box. The two close up photos are a little blurred, but you can see the rivet that attaches the blade to the arm is a tubular rivet. The Judging Standards, page 20-1, states, "Hand wipers were finished in gloss balck enamel with a nickle plated knob and a nickle plated tubular rivet (7/32" head diameter) holding the blade to the arm."
The knob and rivet on this nos wiper show evidence of being nickle plated. The wiper itself is black enamel, appearing to be dipped, but is not real high gloss, which could be from age.
Dave Lopes