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| Start / | Knowledge / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Luminescence / Parallel Issues |
Luminescence parallel issue: the same postage stamps issued at the same time with different luminescences |
Fluorescence quantity parallel issue: the same postage stamps issued at the same time with the same fluorescence in different quantities |
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The same postage stamps with or without fluorescence |
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