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| Start / | Knowledge / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Luminescence / Changes |
Postage stamp luminescence change: the same postage stamps issued chronologic with different luminescences |
Fluorescence introduction: the same postage stamps issued chronologic without and than with fluorescence |
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Edition 09.1961: without fluorescence |
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