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| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Luminescence / Differences |
luminescence difference: common term for two the same postage stamps with no luminescence agreement |
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fluorescence quantity difference: common term for two the same postage stamps with no fluorescence quantity agreement (e.g. with or without fluorescence) |
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