Make- Ready Sheets
I worked in the printing industry for 20+ years and I'm no genius on this matter but these irregularities are most certainly from using Make Ready Sheets to get the press ready for the next run. To " get-up to color, to get registration or to clean a problem" these sheets were always available to help the pressman to get going quickly without "Wasting lots of expensive paper. No doubt some of these sheets got sandwiched into the good sheets and out they went with the product. Same thing happens occasionally with the printing of paper money.
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