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| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Gums / Accidentals |
Gum accidental: philatelic term for a gum deviation caused by an accidental |
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Gum colour accidental: philatelic term for a deviation from the intended gum colour caused by accidental |
Horizontal ribbed gum: postage stamp that was provided with a horizontal instead of vertical ribbed gum caused by accidental |
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Vertical ribbed gum: postage stamp that was provided with a vertical instead of horizontal ribbed gum caused by accidental |
Streaked gum: postage stamp provided with a unevenly gum with stripes, elongated grooves and / or small gum-free areas caused by accidental |
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Gum with alien element: postage stamp in which an alien element was included in the gum caused by accidental |
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