Craig,
I will differ from you a bit. I will guess that a small % of Piedmont 150s, a small % of Piedmont 350s and all EPDGs will show the lines, but that the other backs will not--the reason being that the lines are a print flaw that first appeared at the very end of the 150 print run and lasted until the early stages of the 350 print run when the 150/350 subjects were printed with EPDG.
Scot
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