Just a shot in the dark, but I wonder if it's possible that in some cases ,these lines on plated copper coins could be the result of the copper plating having to much zinc dissolved in it and being poorly mixed, creates brass and copper streaks.?
Since its just one side, roller lines. When going through coin counter/sorter machine on a belt, gets squeezed between the rollers making those marks. May have been hung up in there.
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