The gutter fold is one of the most common and most available misprints. The misprint occurs when the sheet of paper is slight crumpled during the printing process. Due to the the sheet note being flat, parts of the sheet miss the printing. These errors happen all the time. As a result there is a portion of the bill that is completely white because it was protected during the printing process
A heavily circulated gutter fold should command a few dollars over face value. Gutter folds in perfect condition are worth a little bit more.
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