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| Start / | Knowledge / | Issue Kinds / |
| Accidentals | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Shapes | Sizes | Quality |
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Knowledge / Issue Kinds / Sheets / Parallel Issues |
Sheet Parallel Issue: the same sheets issued at the same time (e.g. sheet size) |
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Sheet Size Parallel Issue: the same sheets issued at the same time in different sizes |
Sheet Size Parallel Issue: different sheets issued at the same time in the same size |
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sheet with 4 postage stamps |
sheet with 6 postage stamps |
sheets with 40 postage stamps each |
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