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| Start / | Knowledge / | Separation Methods / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Safety Measures | Quality |
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Knowledge / Separation Methods / Perforations / Changes |
Perforation Change: the same postage stamps issued chronologic with different perforations |
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Perforation Introduction: the same postage stamps issued chronologic without and than with perforation |
Perforation Omission: the same postage stamps issued chronologic with and than without perforation |
Perforation Number Change: the same postage stamps issued chronologic with the same perforation in different numbers |
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Edition 1853: without perforation |
Edition 1916: with perforation |
Edition 1860: fine perforation |
Perforation Kind Change: the same postage stamps issued chronologic with different perforation kinds |
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Edition 1983: comb perforation |
Edition untill 1992: standard perforation |
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