That's very strange!
For the early printing done from stones they erased them and reused them, but I'm having a hard time seeing how the coated aluminum plates used in the 60's-70's could have been resurfaced or rexposed to make a different plate.
I wonder if they were using old partly printed sheets somewhere in the production process.
Or maybe using a blanket that was so worn the image was still there, worn into it from a previous job?
Or..... just maybe they used old plates for the glosscoat?
(This may now be common as the presses make the plate digitally without needing to mount a new one)
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