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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Watermarks / Fakes |
Fake watermark: genuine postage stamp with deceitful bogus watermark or genuine postage stamp with faked watermark |
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Genuine watermark: postage stamp with authentic watermark with no additional forgery |
Watermark forgery: genuine postage stamp with deceitful bogus fake watermark |
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Inverted fake watermark: genuine postage stamp with deceitful bogus inverted fake watermark |
Removed watermark: postage stamp with genuine watermark deceitful bogus eliminated |
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Supplemented watermark: genuine postage stamp with watermark with deceitful supplemented parts |
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