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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 / Fakes |
Fake perforation: genuine postage stamp with deceitful bogus perforation or with faked perforation |
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Genuine perforation: authentic perforation with no additional forgery |
Forgery with perforation: deceitful reprint of a postage stamp, all parts are bogus (design print, perforation) |
Fake perforation: genuine postage stamp with deceitful bogus perforation |
Supplemented fake perforat-ion: postage stamp with genuine perforation with supplemented deceitful bogus perforation |
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Removed perforation: postage stamp with genuine perforation deceitful completely eliminated |
Partly removed perforation: postage stamp with genuine perforation deceitful partly eliminated |
Supplemented fake perforat-ion: genuine postage stamp with cmpletely supplemented deceit-ful bogus perforation |
Partly supplemented fake perforation: genuine postage stamp with partly supplemented deceitful bogus perforation |
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Supplemented missing tooth: postage stamp with genuine perforation with deceitful supplemented missing tooth |
Supplemented perforation holes: postage stamp with damaged genuine perforation with deceitful supplemented perforation holes |
Changed perforation: postage stamp with genuine perforation deceitful replaced by another bogus perforation |
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