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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Designs | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Press Marks / Parallel Issues |
Press mark parallel issue: the same postage stamps issued at the same time with different press marks |
Press mark design parallel issue: different postage stamps issued at the same time with the same press mark design |
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Different postage stamps with the same press mark |
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