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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 / Changes |
Coil Change: the same coils with a time-shifted change |
Coil Postage Stamps Plate Number Change: the same coil postage stamps issued chronologic with different plate numbers |
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6th Plate: plate number "6", 7th Plate: plate number "7" |
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