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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 / Differences |
Perforation difference: common term for two the same postage stamps with no perforation agreement |
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Perforation size difference: common term for two the same postage stamps with no perforation size agreement |
Perforation number difference: common term for two the same postage stamps with no perforation number agreement |
Perforation kind difference: common term for two the same postage stamps with no perforation kind agreement |
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Perforation quality difference: common term for two the same postage stamps with no perforation quality agreement |
Perforation quantity difference: common term for two the same postage stamps with no perforation quantity agreement |
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