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| Start / | Knowledge / | Separation Methods / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Separation Methods / Roulettings / Differences |
Rouletting Difference: common term for two the same postage stamps with no rouletting agreement |
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Rouletting Size Difference: common term for two the same postage stamps with no rouletting size agreement |
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