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| Start / | Knowledge / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Gums / Changes |
Gum Change: the same postage stamps issued chronologic with different gums |
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Gum Omission: the same postage stamps issued chronologic with and than without gum |
Gum Kind Change: the same postage stamps issued chronologic with different gum kinds |
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Edition 10.1933: perforated with gum |
Early Editions: shiny yellowish dextrin gum |
Gum Quality Change: the same postage stamps issued chronologic with the same gum in different qualities |
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Edition 1905: white matt shiny gum |
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