I think the 591s shown are from the same place on the sheet. One shows the line because of the centering and the other one is properly centered so it doesn't show.
The clues are the frame break above the s of Jackson and the line from a plate scratch on shirleys shoulder.
The recurring flaws are interesting, but like Alr said if you look closely enough there are multiple versions of nearly every card.
I collect them, but hardly ever make much effort at finding a particular one. I just keep the different ones when I by a batch of cards.
There's a load of them that should be recognized, as they're obvious differences in production. But there are also some that are recognized that are more in the line of recurring defects.
The different cardboard stock - should be recognized.
Stuff like the 61 Fairly - probably not.
Steve B
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