Really cool thread that I wish I had seen much sooner and posted on.
I guess I've tried to avoid T206 threads since selling my near set of 518 a few years back so as to not get seduced by the monster yet again.
I went back to the images of my set and found that I have two examples that I can share.
Frank "Wildfire" Schulte (Batting) - The plate line runs through the "i" in series down through the "n" in Piedmont
Jimmy Williams - The plate line runs through the "P" in Piedmont down through to the left of the factory designation