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| Start / | Knowledge / | Stamps / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Stamps / Additional Stamp Impressions / Quality |
Additional Stamp Impression Quality: subjective assessment of the quality of all properties of an additional stamp impression |
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Faultless Additional Stamp Impression: additional stamp impression without conditional of manufacturing or wrong handling originated quality defect |
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