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| Start / | Knowledge / | Separation Methods / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Safety Measures | Quality |
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Knowledge / Separation Methods / Perforations / Parallel Issues |
Perforation parallel issue: the same postage stamps issued at the same time with different perforations |
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Perforation size parallel issue: the same postage stamps issued at the same time with the same perforation in different sizes |
Perforation number parallel issue: the same postage stamps issued at the same time with the same perforation in different numbers |
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The same postage stamps with different distance between the perforation lines |
The same postage stamps with fine or coarse perforation |
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Perforation kind parallel issue: the same postage stamps issued at the same time with different perforation kinds |
Partly perforation kind parallel issue: the same postage stamps issued at the same time with partly different perforation kinds |
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Sheet stamps with comb perforation |
Special sheet stamps with harrow perforation |
The same postage stamps with with four-sided comb perforation or with three-sided comb perforation and one-sided line perfor-ation (left side) |
Perforation quality parallel issue: the same postage stamps issued at the same time with different perforation qualities |
Perforation position parallel issue: the same postage stamps issued at the same time with the same perforation in different positions |
Perforation quantity parallel issue: the same postage stamps issued at the same time with the same perforation in different quantities |
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The same postage stamps with the same perforation in different qualities |
The same postage stamps with the same perforation in different positions |
The same postage stamps with the same perforation once or twice |
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