Sometimes a creased sheet of paper is fed into the printing machine, and when it is smoothed out, such things happen.
Thank you for your answer. I wanted to ask do these kinds of paper defects have a technical name to be able to define them?
Hi. Wonder what you think about that diagonal cut on the stamp. Is it due to the initial printing process or is it back to it? Thank you very much.
re: Abnormal cut on 20p