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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Designs | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Press Marks / Errors |
Press mark error: philatelic term for a press mark deviation caused by error |
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Missing press mark: postage stamp with not printed press mark caused by error |
Inverted press mark: postage stamp with inverted instead upright press mark caused by error |
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Double press mark: postage stamp with twice instead of once the same press mark caused by error |
Press mark on front: postage stamp with press mark on front instead on revers caused by error |
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Press mark plate with error: philatelic term for a press mark printed from a damaged printing form caused by error |
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