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| Start / | Knowledge / | Prints / |
| Accidentals | Categories | Changes | Designs | Differences | Errors | Fakes | Issue Occasions |
| Kinds | Mistakes | Parallel Issues | Printers Waste | Safety Measures | Quality | ||
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Knowledge / Prints / Overprints / Safety Measures |
Overprint Safety Measure: safety measures made as overprint |
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Safety Measure Overprint: postage stamp overprinted to avoid forgeries |
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