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| Start / | Knowledge / |
| Accidentals | Changes | Designs | Errors | Fakes | Issue Occasions | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality | Safety Measures |
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Knowledge / Punchings / Errors |
Punching error: philatelic term for a punching deviation caused by error |
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Horizontal punching: postage stamp with horizontal instead vertical punching caused by error |
Inverted punching: postage stamp with 180 degrees rotated horizontal punching caused by error |
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Double punching: postage stamp with twice instead once punching caused by error |
Double punching one invert-ed: postage stamp with twice (horizontal and inverted) instead once horizontal punching caused by error |
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