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| Start / | Knowledge / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Gums / Parallel Issues |
Gum parallel issue: the same postage stamps issued at the same time with different gums |
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Gum colour parallel issue: the same postage stamps issued at the same time with the same gum in different colours |
Gum kind parallel issue: the same postage stamps issued at the same time with different gum kinds |
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Different postage stamps with blue gum |
The same postage stamps with full gum or economy gum |
Gum kind parallel issue: different postage stamps issued at the same time with a gum in different kinds |
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Different postage stamps with economy gum |
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