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| Start / | Knowledge / | Stamps / |
| Accidentals | Categories | Changes | Designs | Differences | Errors | Fakes | Issue Occasions | |
| Kinds | Mistakes | Parallel Issues | Printers Waste | Safety Measures | Sizes | Quality | ||
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Knowledge / Stamps / Stamp Impressions / Quality |
Stamp Impression Quality: subjective perception of a stamp impression quality |
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Faultless Stamp Impression: stamp impression without conditional of manu-facturing or wrong handling originated quality defect |
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