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| Start / | Knowledge / | Separation Methods / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Separation Methods / Roulettings / Parallel Issues |
Rouletting Parallel Issue: the same postage stamps issued at the same time with different roulettings |
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Rouletting Size Parallel Issue: the same postage stamps issued at the same time with the same rouletting in different sizes |
Rouletting Design Parallel Issue different postage stamps issued at the same time with the same rouletting design |
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the same postage stamps with different distance between the rouletting lines |
different postage stamps with the same serrate rouletting |
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