Hi Steve
As you know, I do some research on this subject (T206 sheets). If I locate any T206s with these lines, I'll post them up.
One card that comes to mind is the Randall "Milwaukef" card. They all seem to a small line/plate scratch one the back of the card. Only a fraction compared to the ones you have posted in this thread. Piedmont 350 f25 incase you were wondering.
If there is any way I can help, let me know.
Jantz
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