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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Silk Threads / Changes |
Silk thread change: the same postage stamps issued chronologic on paper with different silk threads |
Silk thread omission: the same postage stamps issued chronologic with and than without silk thread |
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Edition 1857: with silk thread |
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