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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 / Differences |
Watermark Difference: common term for two postage stamps with no watermark agreement |
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Watermark Design Difference: common term for two the same postage stamps with no watermark design agreement |
Watermark Alignment Difference: common term for two the same postage stamps with no watermark alignment agreement |
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Watermark Quantity Difference: common term for two the same postage stamps with no watermark quantity agreement (e. g. without or with watermark) |
Watermark Space Difference: common term for two the same postage stamps with no watermark space agreement |
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