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| Start / | Knowledge / | Separation Methods / |
| Accidentals | Differences | Errors | Fakes | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Separation Methods / Cuts / Parallel Issues |
Cut parallel issue: the same postage stamps issued at the same time with different cuts |
Cut position parallel issue: the same postage stamps issued at the same time with the same cut in different positions |
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The same postage stamps with good |
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