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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 / Parallel Issues |
Stamp Impression Parallel Issue: the same postal stationeries issued at the same time with different stamp impressions |
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Stamp Impression Shape Parallel Issue: different postal stationeries issued at the same time with the same stamp impression in different shapes |
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stamped envelope with oval or octagonal stamp impression |
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Stamp Impression Design Parallel Issue: different postal stationeries issued at the same time with the same stamp impression design |
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stamped envelope and stamped money order with the same stamp impression |
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Stamp Impression Quantity Parallel Issue: the same postal stationeries issued at the same time with the same stamp impression in different quantities |
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postcards with once or twice the same stamp impression |
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