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| Start / | Knowledge / |
| Accidentals | Changes | Designs | Errors | Fakes | Issue Occasions | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality | Safety Measures |
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Knowledge / Punchings / Parallel Issues |
Punching parallel issue: the same postage stamps issued at the same time with different punchings |
Punching alignment parallel issue: different postage stamps issued at the same time with the same punching |
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The same postage stamps with the same diagonal |
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