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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Watermarks / Errors |
Watermark error: philatelic term for a watermark deviation caused by error |
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With watermark: postage stamp printed as not intended style on paper with watermark caused by error |
Missing watermark: postage stamp printed as not intended style on paper without watermark caused by error |
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Partly missing watermark: postage stamp printed on paper with partly missing watermark caused by error |
Mixed up watermark: postage stamp printed on paper with a different watermark as intended caused by error |
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Watermark text error: philatelic term for deviation in the watermark text caused by error |
Watermark design error: philatelic term for a deviation in the watermark design caused by error |
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Inverted watermark: postage stamp printed on paper with 180 degrees rotated horizontal watermark caused by error |
The wrong way round watermark: postage stamp printed on paper with the wrong way round watermark caused by error |
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Vertical watermark: postage stamp printed on paper with vertical instead of horizontal watermark caused by error |
Horizontal watermark: postage stamp printed on paper with horizontal instead of vertical watermark caused by error |
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Watermark mold with error: philatelic term for a watermark made from a damaged mold form caused by error |
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