Hello again Jim, I had the following from Robin this evening
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I'm afraid your correspondent was mistaken in assuming the flaw was the SG4K-listed Pb3. That flaw is found on the fifth state of the cylinder slightly to the left. This one is closer to the crown (and the Crown).
The flaw illustrated in the message is, as far as I can tell, ephemeral. That is to say, it is not a constant flaw caused by some kind of damage to the cylinder but is caused by a temporary or momentary inking error. In some cases, such a flaw might have lasted a few turns of the cylinder but essentially, it would have very soon been removed by the Doctor Blade.
As the piece in question has a comparatively narrow margin it is not possible to tell the stage in the printing it came from.
Sorry to be a disappointment.
All the very best, Robin
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Hope this is of interest Regards Ron.
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