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| Start / | Knowledge / |
| Accidentals | Changes | Errors | Fakes | Issue Occasions | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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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 punching from bottom left to top right |
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