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| Start / | Knowledge / | Stamps / |
| Accidentals | Categories | Changes | Designs | Differences | Errors | Fakes | Issue Occasions | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality | Safety Measures | Shapes |
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Knowledge / Stamps / Stamp Impressions / Quality |
Stamp Impression Quality: subjective assessment of the quality of all properties of a stamp impression |
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Faultless Stamp Impression: stamp impression without cond-itional of manufacturing or wrong handling originated quality defect |
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