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| Start / | Knowledge / | Issue Kinds / |
| Changes | Differences | Fakes | Issue Occasions | Kinds | Parallel Issues | Quality |
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Knowledge / Issue Kinds / Coils / Differences |
Coil difference: common term for two the same coils with no agreement |
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Coil kind difference: common term for two the same coils with no kind agreement (e.g. horizontal or vertical) |
Coil postage stamp plate number dif-ference: common term for two the same coil postage stamps with no plate number agreement |
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