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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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