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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 / Errors |
Rouletting Error: philatelic term for a rouletting deviation caused by error |
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Missing Rouletting: postage stamp with not executed roul-etting caused by error |
Partly Missing Rouletting: postage stamp with partly not executed rouletting caused by error |
Rouletting Number Error: philatelic term for a deviation from the intended rouletting number caused by error |
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Double Rouletting: postage stamp with twice instead once rouletting caused by error |
Partly Double Rouletting: postage stamp with partly twice instead once rouletting caused by error |
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