I had posted this gutter pair before in the middle of a post, but looked closely and there is a roller mark..Is it called a "roller mark" or is there a different name for it...?
Quote: Doctor blade flaw - in modern high-speed printing machines surplus ink is removed from the printing surface by a flexible steel blade, known as the doctor blade. This process can cause characteristic flaws on the printed stamps. Until worked out this can cause a non-constant flaw.
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Posted 06/20/2018 12:30 pm
