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| Start / | Knowledge / | Issue Kinds / |
| Accidentals | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Shapes | Sizes | Quality |
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Knowledge / Issue Kinds / Sheets / Fakes |
Fake sheet: sheet forgery or deceitful bogus original sheet |
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Genuine sheet: authentic sheet with no additional forgery |
Sheet forgery: deceitful reprint of a sheet, all parts are bogus (design print, perforation) |
Sheet with inverted fake postage stamp: sheet with cut out genuine and 180 degrees rotated deceitful insert postage stamp |
Sheet with exchanged post-age stamp: sheet with bogus replaced genuine postage stamp by another genuine or fake postage stamp |
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Sheet with exchanged invert-ed postage stamp: sheet with bogus replaced genuine postage stamp by another 180 degrees rotated genuine or fake postage stamp |
Sheet with partly removed design print: genuine multi-colour sheet with deceitful partly eliminated design print |
Fake sheet colour: genuine sheet with deceitful changed design print colour |
Partly fake sheet colour: genuine multicolour sheet with deceitful changed partly design print colour |
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Sheet with swapped postage stamps: genuine sheet with deceitful removed and then swapped back postage stamps |
Trimmed sheet: genuine sheet with deceitful cut off damaged edge |
Sheet with repaired tear: genuine sheet with deceitful reweaved damaged paper |
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