As shown in French's book.
see scans and arrows
French describes this as broken relief on the printing plate.
Close up of one dot
Close up of 2 dot see arrow
Some times the 2 dot examples show a double transfer.
Condition: both space fillers
The enlargements are blurred a little bit to show the "DOT" so the one dot example looks sort of like a 2 dot!
The 2 dot example show more plate wear then the one dot example (Common sense)!

 
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