"Doctor blade faults" is probably the correct term, because if they were trying to line up anything, then they failed miserably. It is just odd that these two were among my only four copies ... It must be very, very common.
Those are lay out lines. They are on the plate to help place the transfer roller in the correct position to rock in an image, normally "erased" before printing, usually by burnishing the line out.
I worked in rotogravure industry for a while, and these lines would be called "streaks" which are doctor blade faults. If the same principal applies to engraved stamps, then these most likely are "streaks". Streaks like that are almost always accompanied by much fainter once, often only visible on the white paper.
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Posted 05/01/2015 01:38 am
