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| Start / | Knowledge / | Prints / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Silk Threads / Parallel Issues |
Silk Thread Parallel Issue: the same postage stamps issued at the same time on paper with different silk threads |
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Silk Thread Position Parallel Issue: the same postage stamps issued at the same time on paper with the same silk thread in different positions |
Silk Thread Quantity Parallel Issue: the same postage stamps issued at the same time on paper with the same silk thread in different quantities |
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postage stamps with the same silk thread at top or in the middle |
postage stamps with once or without silk thread |
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