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| Start / | Knowledge / | Stamps / |
| Accidentals | Categories | Changes | Designs | Differences | Errors | Fakes | Issue Occasions | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality | Safety Measures | Shapes |
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Knowledge / Stamps / Stamp Impressions / Safety Measures |
Stamp impression safety measure: safety measures made as stamp impression |
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Safety measure stamp impression: stamp impression in a intricate graphic print to prevent forgeries |
Stamp impression with embossing: stamp impression partly printed as emboss-ing to prevent forgeries |
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Matrix code: safety measure consisting of lines, dots and gaps arranged in a matrix with his help the postage stamp can be cancelled electronically |
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