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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 not printed chalky overprint caused by error |
Double chalky overprint: postage stamp with twice in-stead of once the same chalky overprint caused by error |
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Chalky overprint on reverse: postage stamp with chalky overprint on reverse instead on front caused by error |
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