That's a really interesting mark, At first I thought it was a poorly erased bit of Sweet Caporal back, but it doesn't match up all that well.
Quote:
Originally Posted by Pat R
This is just an opinion based on the statistics I have on several
print flaws but I think most of the non Piedmont and Sweet Caporal
sheets had fewer vertical rows of the same subjects for example
a Frank Owen flaw is found on 3 out of 5 EPDG's but the same
flaw is found on only 13 out of 152 Piedmont's and other flaws
have comparative statistics when they're found on one of the
uncommon backs.
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The really common backs I believe were done in multiple identifiable press runs. That would skew the numbers to make it look like a larger sheet.
But different sheet layouts certainly are possible and in some cases likely.