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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 / Errors |
Perforation error: philatelic term for a perforation deviation caused by error |
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Missing perforation: postage stamp with not executed perfor-ation caused by error (imperfor-ated) |
Partly missing perforation: postage stamp with partly not executed perforation caused by error |
Perforation number error: philatelic term for a deviation from the intended perforation number caused by error |
Partly perforation number error: philatelic term for a partly deviation from the intended per-foration number caused by error |
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Inverted perforation: postage stamp with 180 degrees rotated perforation caused by error |
Double perforation: postage stamp with twice instead once perforation caused by error |
Partly double perforation: postage stamp with partly twice instead once perforation caused by error |
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Albino perforation: postage stamp with not fully punched out perforation holes but only slightly pressed in caused by error |
Partly albino perforation: postage stamp with partly not fully punched out perforation holes but only slightly pressed in caused by error |
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