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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Errors | Fakes | Mistakes | Printers Waste |
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Knowledge / Safety Measures / Chalky Overprints / Errors |
Chalky Overprint Error: philatelic term for a chalky overprint deviation caused by error |
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Missing Chalky Overprint: postage stamp with caused by error not printed chalky overprint |
Double Chalky Overprint: postage stamp with caused by error twice instead of once the same chalky overprint |
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Chalky Overprint on Reverse: postage stamp with caused by error chalky overprint on reverse instead on front |
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