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| Start / | Knowledge / |
| Accidentals | Changes | Errors | Fakes | Issue Occasions | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Punchings / Issue Occasions |
Punching Issue Occasion: summary of the different punching occasion reasons |
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Category Change Punching: postage stamp punched to change the stamp category |
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Specimen Punching: postage stamp punched for the use as specimen to avoid postal use |
Transport Punching: punchings between two ATM design print images to ensure a uniform paper feed |
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