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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 / Parallel Issues |
Watermark parallel issues: the same postage stamps issued at the same time with different watermarks |
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Watermark text parallel issues: different postage stamps issued at the same time with the same watermark text |
Watermark design parallel issues: the same postage stamps issued at the same time with different watermarks |
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Postage stamps with the same text watermark "DEUTSCHE POST" |
Postage stamps with watermark "network" or "quatrefoils" |
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Watermark design parallel issues: different postage stamps issued at the same time with the same watermark design |
Watermark alignment parallel issues: the same postage stamps issued at the same time with the same watermark in different alignments |
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Postage stamps from Italy with watermark "crown" |
Postage stamps from 3 postal areas with watermark "crown and C A" |
Postage stamp with vertical or horizontal watermark |
Watermark quantity parallel issues: the same postage stamps issued at the same time with the same watermark in different quantities |
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Postage stamp without or with watermark |
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